投稿時間:2023-07-06 00:24:49 RSSフィード2023-07-06 00:00 分まとめ(30件)

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IT	ITmedia 総合記事一覧	[ITmedia News] Twitter対抗「Threads」、日本でもダウンロード始まる　ただし使えるのは6日夜から	https://www.itmedia.co.jp/news/articles/2307/05/news184.html	instagram	2023-07-05 23:40:00
IT	ITmedia 総合記事一覧	[ITmedia News] SBI、半導体製造に参入　台湾企業と共同で日本に工場建設へ　北尾氏「絶好のチャンス」	https://www.itmedia.co.jp/news/articles/2307/05/news183.html	conductor	2023-07-05 23:20:00
AWS	AWS Architecture Blog	Let’s Architect! Governance best practices	https://aws.amazon.com/blogs/architecture/lets-architect-governance-best-practices/	Let s Architect Governance best practicesGovernance plays a crucial role in AWS environments as it ensures compliance security and operational efficiency In this Let s Architect we aim to provide valuable insights and best practices on how to configure governance appropriately within a company s AWS infrastructure By implementing these best practices you can establish robust controls enhance security and maintain compliance …	2023-07-05 14:34:26
AWS	AWS Mobile Blog	Client-side Caching Strategies for a Next.js app with AWS Amplify	https://aws.amazon.com/blogs/mobile/client-side-caching-strategies-for-a-next-js-app-with-aws-amplify/	Client side Caching Strategies for a Next js app with AWS AmplifyThis post builds on the initial posts in this series nbsp Build a Product Roadmap with Next js and Amplify where we built an admin page for product managers to login and update the roadmap and then updated the app to nbsp add storage of documents In this post we ll adapt the product management application to include a caching layer …	2023-07-05 14:39:30
python	Pythonタグが付けられた新着投稿 - Qiita	python初心者がダンジョンゲーム作成してみる	https://qiita.com/tsuyoron515/items/08a1751ffdcc54107ae4	daypygame	2023-07-05 23:41:11
python	Pythonタグが付けられた新着投稿 - Qiita	【2023年7月版】Pythonで日本の祝日を判定するライブラリを作ってみた	https://qiita.com/flarebrow/items/c2e54db73130630d2c01	chatgpt	2023-07-05 23:33:37
js	JavaScriptタグが付けられた新着投稿 - Qiita	【Ruby&JavaScript入門】プログラム初心者が複数のプログラミン言語を比較しながら復習するための練習帳《その3》	https://qiita.com/asuka-80/items/dae36df2469b958c8146	javascript	2023-07-05 23:26:02
Ruby	Rubyタグが付けられた新着投稿 - Qiita	【Ruby&JavaScript入門】プログラム初心者が複数のプログラミン言語を比較しながら復習するための練習帳《その3》	https://qiita.com/asuka-80/items/dae36df2469b958c8146	javascript	2023-07-05 23:26:02
Ruby	Rubyタグが付けられた新着投稿 - Qiita	RubyでAtCoder ABC308(A, B, C)を解いてみた	https://qiita.com/shoya15/items/623fa1776be568ada428	atcoder	2023-07-05 23:20:15
AWS	AWSタグが付けられた新着投稿 - Qiita	[AWS Q&A 365][Fargate]AWSのよくある問題の毎日5選 #91	https://qiita.com/shinonome_taku/items/bc8431295948c05a3e58	amazon	2023-07-05 23:28:05
AWS	AWSタグが付けられた新着投稿 - Qiita	[AWS Q&A 365][Fargate]Daily Five Common Questions #91	https://qiita.com/shinonome_taku/items/a2092042578ee0db11b4	definitions	2023-07-05 23:27:25
技術ブログ	Developers.IO	AWS Chalice を使って、Slack App (Slack Bolt for Python) を作成してみた	https://dev.classmethod.jp/articles/aws-chalice-slack-app-bolt-for-python/	appslackboltforpython	2023-07-05 14:18:56
海外TECH	DEV Community	Denylists and Invaliding user access	https://dev.to/authress/denylists-and-invaliding-user-access-1cgl	Denylists and Invaliding user accessThis articles discusses and reviews the different ways to invalidate a user s access and revoke their tokens It discusses solutions for DenylistsOAuth JWT token expiryAPI GatewaysRefresh Tokens BackgroundTo secure communication between different systems or services that you have an access token is sent between the user client or machine to your service API Usually this is some sort of JWT access token In the case of Authress and other providers a JWT token is generated when the user logs in that token is available for them to gain access to their resources and prove their identity to your services When that token expiries they must then fetch a new token Fetching new tokens won t be discussed in this article the KB has additional articles on Authress Authentication However there are cases where we want to terminate access as soon as possible User role changes permission revocation or token exposures all may facilitate the need to terminate access OAuth JWT access tokens ScopesMany authentication solutions and identity providers generate JWT access tokens and provide these as a way to authenticate users to your applications They are generated for the user in the UI and are sent to your services via the Authorization header Generated JWTs are usually created through a standardized OAuth exchange the details of which aren t immediately relevant here but there are a number of other Authress KB articles that discuss the topic For the rest of the article we ll assume that you know what a JWT access token and how to get one If you are unsure please don t hesitate to join our Community and ask In the case of authentication solutions that do not offer any sort of authorization or access control they may attempt to store a user role or roles in the JWT in the scope JWT property claim OAuth JWT ScopesThe OAuth JWT scope claim is a property which contains a list of permissions and roles that the user has approved to be passed to the JWT However since the User gets their own JWT this may seem unnecessary complex The standard OAuth use case is that the requestor of the JWT is not the same as the User themselves That is your user is actually approving the generation of the JWT by your UI And then your service will validate the JWT Scopes here are a way to restrict what permissions the user is passing to the token When this JWT is used the scopes provide a way to filter the resources that are actually allowed to be accessed Example The user has access to all their own resources of the types documents videos photosA UI could request the scopes documents and photosThe user approves the UI requests for those scopes iss scope documents photos sub user id iat exp scope openid profile email aud The generated JWT would only contain the documents and the photos scopes and not the videos one That means of all the resources that the User has access to the JWT only has access to user s documents and photos You ll notice that scopes are not the same as permissions the user has The user has permissions to only some resources but the scopes have even more limited access Scopes constrain access based on what the user already has permissions to The optimal use of OAuth JWT Scopes are used when you don t control both the UI and the Service and there are two reasons for that Most Authentication providers allow the User to specify any and all scopes that they want in the token This means if you are using the Scopes to control access to resources that the user can interact with you have a vulnerability You are letting your users control what they have access to Scopes must not be used for access control for the User You ll need some to capture which permissions the user actually gave to another service If a third party is accessing your resources or you are accessing a third party s resources the scopes granted to the client application control that access This is a different list of permissions because it is a different entity performing the API request Issues with scopesSince scopes are embedded into the JWT token as long as the JWT token is valid between the nbf and exp times then the holder of that token has access to the user s resources that are granted via the scopes in the token This means that there is no way to block requests in a situation where you want to invalidate the access that the token grants This is the OAuth spec and while it seems like a missing part of the specification if we consider the difference between the access granted to the user and the scopes granted to the third party on behalf of the user it makes sense that in most cases this doesn t matter Invalidating a JWT wouldn t make sense This also makes sense when we consider what these JWT tokens are A JWT access token is a representation of a user identity The Authentication Service generates the token to represent the user s identity and then the user client or third party presents that token to prove who they are However it doesn t really say anything about what they can access or why Further JWTs don t stop representing the user just because their access changes As discussed in Academy for access control strategies and token attenuation The most common mistake is putting the roles or permissions into the JWT When the permissions are in the JWT using the scope or a custom claim the permissions have become coupled to the identity of the user These are separate things and deserve separate treatment and we ll go into some of the further issues and resolutions below Revoking a JWT access tokenNow that we know that the permissions coupling to the JWT access token creates some problems we can discuss what we can do about it Do nothing approachThe default and simple approach is to do nothing For most implementations and products this may be the best answer however if you are in Healthcare Banking or another highly regulated government industry this is not going to be the right approach and skipping this step is recommend When the JWT expires the user will lose access to the scopes and permissions that were specified in the token This may seem bad from a security standpoint however in most cases this is exactly the flow that makes the most sense Most cases don t need to be concerned with malicious attackers using still valid JWTs When the user signs out of the UI discard the JWT Once it leaves memory it should no longer be a problem If this were a problem that the hypothetically saved JWT could still be used we can question How If the token is available to be used after log out and we are concerned that it will be how did that come to happen One common answer is that the user is using a shared machine However on shared machines user log out is not reliable and shared machines are not truth worthy Simply logging out even if the token were revoked will not prevent vulnerabilities from existing to utilize the token and impersonate the user It is an illusion that there is a solution to this problem other than terminating the OS of the machine which still might not be sufficient Limiting the access token lifetimeGoing further would be to ensure that the lifetime of the token is as limited as possible With authentication session management we can generate an additional token for the user when the current one expires So instead of hours hours or even hour if the token expiry is in minutes then every minutes the user will get a new token Even if the user doesn t log out that token is going to expiry in the next minutes almost completely reducing the feasibility of an attack using an exfiltrated token Using Authress or another centralized authentication identity provider you might be able to configure the token lifetime to automatically expire Use a shared DenylistIn a platform where you have many services creating an endpoint on one service that allows the user to logout thereby storing that timestamp isn t sufficient to ensure that the token with the scopes doesn t get used again This leads to the need to have a unified solution for token management We already know we need a unified solution for authentication but this adds an additional layer of complexity One common solution is the creation of an API gateway An API Gateway is a reverse proxy for all the services in your platform The API Gateway receives every request verifies that the token is valid based on your identity provider and internal token cache and then forwards the request or denies it Additionally it can offer an endpoint that allows your services to revoke a still valid identity token The drawback with this is that it requires this additional piece of technology on top of your existing Authentication IdP and it also introduces a requirement that your user logout now needs to call to your exposed API Gateway in order to invalidate these tokens There are some solutions that make storing this data in a database easier but it is still something extra you ll need to add to your API Gateway Distributed Cache Alternative If you aren t interested in setting up an API Gateway which often is infeasible in a multi region deployment or in a highly distributed system then alternatively a distributed shared caching solution can work The Authress recommendation is to avoid having a shared cache wherever possible since it increases the cost of maintenance and often serves as a single point of failure that wasn t designed to handle fault tolerance at the scale that IdPs are designed for See Authress downtime protections for some of these fault tolerant protections Permission changesSo far we have only discussed the need to invalidate credentials when the user logs out but what happen when their roles and permissions change Your API Gateway isn t going to be sufficient to know what to do unless you add permission and role changes to it as well At that point you ve designed your own AuthZ solution and it would be better to use an existing IdP as part of your reverse proxy solution And in that case you might want to check out Building your own AuthZ solution And worse if you invalidate the token in the API Gateway your users in your UI never know they need to get a new token The invalidation happened on the service side without the users knowledge They ll start getting back errors from the API Gateway A workaround would be to add handling code to your UI to force a re login when a is seen as a response from a service But then this code has to be replicated to every UI you have and not every service might be behind the API Gateway that means special handling would also be necessary for invalidations to know which service the user is calling from the UI Some calls can expect a while others a means my roles changed That can cause a poor UX for the user if they are forced to log out every time their roles are changed The best solution here is to decouple the authorization from the token itself By storing the authorization access control and permissions for the user in a separate service from the user identity handling when the access changes then no further updates are necessary That s because authorization is checked realtime instead of only being populated during token generation With JWT scopes the permissions and roles are cemented into the token but with an Authorization solution the access is dynamic When roles change so does the user s live access This is a significant improvement because there is no extra storing of access tokens nor a need to invalidate them one by one Additionally depending on the solution you are using in this case if we assume Authress Authentication when the user logs out the user s session may also be terminated on the provider side Meaning that a solution that offers both Authentication and Authorization and keeps them segregated works best for handling token invalidation ConcernsOne common concern as we go further down this list is the reliance more and more on a shared centralized system And most shared systems are not fault tolerant they weren t build to scale nor built to be reliable Many open source implementations of token invalidation caching and gateways suffer from this lack of reliability And the more reliable they were designed the more difficult they are to maintain that s because they pass the burden of maintenance onto the development team that runs the open source solution It s better to go with high SLA AuthN solution that already supports your needs out of the box Rather than having to build this yourself and maintain it finding the right product that fits your needs is a must The current auth situation report is available in the KB for a deep dive on the different auth technology pieces Here are some hints about how reliable these solution are Reliability designed inHigh SLA services at least four s are designed with this distributed reliability in mind It isn t a single point of failure since frequently the service itself has been replicated to multiple regions in multiple datacenters with additional backups your technology often can be anywhere in the world and your users can be on the opposite side and both your services and the user can experience very low latency This is often achieved with distributed CDNs and edge node authentication Selection of the right protocol and technologyWhen designing token invalidations a large part of the ability to even execute effectively requires picking technologies that are by default high performance Some providers offer the EdDSA token signature standard which is faster and produces smaller signatures Utilizing distributed public keys enables a hands off approach to verifying credentials Using one of these providers that supports public key encryption enables tools like an API Gateway or the services themselves to verify tokens without even making any API calls The public keys are cacheable for an extended period of time Enabling fast requests without the single point of failure Clear separation of responsibilitiesSolutions that recommend storing the access permissions inside the identity JWT immediately get off to a bad start We ve seen from above this encourages coupling in a way which cases issues at the important security edge cases While it can seem like an optimization for simplicity it actually just creates problems There are very few products services and applications where JWT scopes for permissions actually is a good fit Therefore the selection of a technology that provides the separation between identity and access control is important Going further What about refresh tokensRefresh tokens are part of the OAuth standard that exist to enable third party services to impersonate users even when the user s JWT access token has expired That has nothing to do with token invalidation and don t help us at all here in our use case Revocation comes up often with OAuth because documentation sources often point to Refresh tokens as a solution That s because in the OAuth spec Refresh tokens can actually be revoked and solutions recommendations and implementations get stuck on this part Refresh tokens are long lived and revoking them prevents new access tokens from being generated from that Refresh token But just because the refresh token is revoked does not mean that the access token is revoked And in almost all implementations that is the case because access tokens are validated on the client side but the revocation database is on the service side So attempting to use refresh token revocation to block access token usage would require every API request to unnecessarily call out to the revocation database to verify the token This converts the standard distributed offline public key process for token verification to be online centralized and slow For help understanding this article or how you can implement a solution like this one in your services feel free to reach out to the Authress development team or follow along in the Authress documentation	2023-07-05 14:15:26
海外TECH	DEV Community	Connect ChatGPT to the Internet	https://dev.to/polterguy/connect-chatgpt-to-the-internet-3a1f	Connect ChatGPT to the InternetAs of today we can connect our ChatGPT based AI chatbots to the internet allowing you to use our AI chatbot technology to search the internet and discuss real time live information from the web with ChatGPT From before our AI chatbots already displays images of course and hyperlinks references lists emojis etc Our new browse the web with ChatGPT feature obviously takes advantage of these features To understand why this is such a big deal you can go to ChatGPT and ask it the following question Who won the US Open in At which point you ll get the following result If you ask our chatbot the following question Search the internet for the following query Who won the US Open in and give me a summary with some imagesYou ll get the following answer Notice it is important that you start out your question with exactly the following Search the internet for the following query QUERY HERE This is because we re semantically matching your prompt towards our training snippets where one of our training snippets contains Hyperlambda This training snippet will kick in for the above sentence as your first hit most of the time and be dynamically executed and return the result of your search query as context ImplementationThe way it s implemented is to some extent described in our ChatGPT with real time information article and our connect ChatGPT to your SQL database article And since we already had ChatGPT with DuckDuckGo support and a kick ass web scraper The rest was just a matter of connecting the dots The way it works is that we ve got a training snippet that starts out with the words Search the internet for the following query This training snippet contains Hyperlambda that basically searches and scrapes the result originating from DuckDuckGo If you phrase your question such that this training snippet bubbles to the top it will execute its Hyperlambda which resembles the following Prompt Search the internet for the following queryCompletion querystrings split x arguments prompt set value x query get value x strings split unwrap x signal magic ai create search context query x query max tokens int resultset value x result strings concat While searching the internet for get value x strings split the following is what I found r n r n get value x signalreturn x result Once executed the above Hyperlambda will return whatever it found related to your query as Markdown and us this as a context for ChatGPT This allows ChatGPT to answer your question using real time data from the internet Notice only the parts between the double quotes will be sent to DuckDuckGo while the whole question will be sent to ChatGPT This allows you to ask questions such as for instance Search the internet for the following query Steve Jobs and show me all images of SteveOr Search the internet for the following query Bill Gates and write a paragraph article about Bill s lifeEtc The scraping is done in parallel and you can configure how many context tokens you want to use and or how many results you want to have DuckDuckGo return etc The parallel parts makes it surprisingly fast since it will scrape for instance web pages in parallel and not sequentially and aggregate the results of yoru query It also keeps the source for where it found the data and will most of the time automatically display this If you must have the source you can also explicitly tell ChatGPT that it must provide its source ConclusionThis implies that as of today we can deliver internet access to your ChatGPT AI chatbot if required The feature is a little bit BETA ish still and we re still discussing pricing internally and we ll probably not offer this in our basic package but only from professional and up Since I assume this would be most interesting for our AI Expert Systems allowing you to aggregate whatever you can figure out how to search for into your AI querying However if you want to discuss this with us we d be happy to have an email from you and help you out getting a ChatGPT chatbot connected to the web	2023-07-05 14:03:01
Apple	AppleInsider - Frontpage News	Apple releases full trailer for Scorcese's 'Killers of the Flower Moon'	https://appleinsider.com/articles/23/07/05/apple-releases-full-trailer-for-scorceses-killers-of-the-flower-moon?utm_medium=rss	Apple releases full trailer for Scorcese x s x Killers of the Flower Moon x A two minute trailer for Apple TV movie Killers of the Flower Moon has been released ahead of its October theatrical run Leonardo DiCaprio in Killers of the Flower Moon Following a brief teaser trailer in May Apple TV is now showing more of what it calls an epic Western crime saga Read more	2023-07-05 14:15:25
Apple	AppleInsider - Frontpage News	Apple's MacBook Air M2 in Midnight is on sale for $979 ahead of Prime Day	https://appleinsider.com/articles/23/07/05/apples-macbook-air-m2-in-midnight-is-on-sale-for-979-ahead-of-prime-day?utm_medium=rss	Apple x s MacBook Air M in Midnight is on sale for ahead of Prime DayDeals continue to pour in ahead of Prime Day with Apple s M MacBook Air the latest product to receive aggressive price cuts Get an M MacBook Air for The record low price is courtesy of Apple Authorized Reseller B amp H Photo when you pick up the standard model with an core GPU GB of memory and a GB SSD in the popular Midnight finish Read more	2023-07-05 14:08:51
海外TECH	Engadget	The best projectors you can buy in 2023, plus how to choose one	https://www.engadget.com/best-projectors-123004354.html?src=rss	The best projectors you can buy in plus how to choose oneHome theater projectors have come a long way from the clunky dim models of the past The latest models are brighter sharper more discreet and easier to install than ever They also deliver a picture size with image quality you could never get on a TV without spending a fortune With all that the best projectors are highly desirable for people who want a true big screen cinematic viewing experience Over the last year we ve seen models bright enough to use in a normal room short throw models that take up very little space and have built in sound bars and better picture quality than ever with K and Dolby Vision features Better still you can now get K HDR models that can project an image size up to inches for as little as That s around the same price and over double the size of a decent inch TV giving you something close to true movie theater immersion with a home theater projector There are a lot of different types of projectors though ranging from ultra short throw to portable to long throw There are also a lot of terms to understand like lens shift LCD vs DLP laser vs lamp illumination and more This buying guide will help you with everything you need to understand before purchasing the best projector for your needs within your budget The technologyWhat to look for in a projectorBest ultra short throw projectors under Best ultra short throw projectors under Best projectors under Best projectors under Best projectors under Best budget portable projectorsThe technologyHere are the basics Projectors generally use two types of technology LCD and DLP They re fundamentally different systems with their own advantages and drawbacks The rise of ultra short throw projectors and brighter long throw models meanwhile has been powered by falling prices in laser illumination technology Lasers are a far better solution than lamps because they re brighter and last far longer ーup to hours instead of That s essentially a lifetime of use about years Most projector manufacturers now use DLPs or digital light processing units manufactured nearly exclusively by Texas Instruments TI The heart of the tech is an optical semiconductor called a digital micromirror device DMD that contains millions of aluminum mirrors Those tilt either toward the light source on or away from it off at up to times per second Budget projectors like BenQ s HTi use TI s inch DMD while higher end models like the Samsung Premium LSPT use the inch chip Both use mirrors that tilt by and degrees for white and black but TI recently unveiled a new inch K capable DMD with degrees of tilt which should enhance both brightness and contrast DLP projector makers include LG Optoma LG BenQ and Panasonic The benefits of the tech are portability high contrast less fringing and cheaper projectors especially K and ultra short throw models The biggest drawback is the rainbow effect or bright red blue green artifacts that affect some viewers more than others LCD tech meanwhile uses a prism to split a light source into red green and blue beams Those then pass through LCD displays containing the image and converge via another prism before passing through the projector s lens Epson is the primary user of LCD tech along with Sony Sanyo and others LCD projectors tend to be sharper more efficient and more color accurate but have lower contrast ratios and can experience image degradation over time In general they re also more expensive What to look for in a projectorUltra short throwSince the last time we updated our guide ultra short throw projectors have become the hot new category offering several benefits You can mount them close to the wall like a TV with no need to run wires through the walls and ceiling but still get an immersive image as large as inches ーsomething that s impossible with a TV unless you re very rich They use brighter lasers that never need to be replaced ーand because laser light is collimated focusing is eliminated They re also physically less awkward to install than a ceiling mounted projector though that doesn t mean installation is super easy To get the perfect screen fit and alignment you must place them an exact height and distance from your wall or screen This can be quite a pain as I ve discovered You also need a perfectly flat wall or projector screen because ultra short throw projectors beam up at an acute angle so any imperfections will show as shadows For that reason you can t use a roll down screen because they have slight ripples For the best results particularly with a lot of ambient light you should use an ambient light rejecting ALR screen Those have small ridges that reflect light from below back to your eyes but absorb any light ie ambient light that comes from above For one of those you ll need to budget at least and way up Some projectors including models from Epson and HiSense come with ALR screens Elite Starling Brightness and contrastHome theater projectors generally range in brightness between to lumens but you ll need to take those figures with a grain of salt Some models might actually hit lumens or more but cranking the lamp to that level will hurt the image quality and lifespan of your bulb Also some manufacturers tend to exaggerate maximum brightness As a point of reference many K flat panel TVs nowadays can hit nits of brightness but the brightest consumer projectors only display between and nits from the screen That s not as big a deal as it might seem because projector images are much larger and meant to be used in dark rooms where your eyes will automatically adjust to the light and “brighten the image Contrast is also substantially different on home theater projectors Unlike OLED TVs projectors don t allow for zero black levels because of ambient light reflections and other reasons You also can t have local dimming zones found on LED TVs for true blacks Some projectors do have a dynamic iris to improve the contrast scene by scene but those can often produce a “pumping effect with the image dimming or brightening in mid scene Mounting and fan noiseA big advantage of regular long throw projectors is that you can mount the projector and screen on the ceiling using zero space in your room If you plan to do that don t forget to budget for a mounting bracket and any necessary long cables including extra power for Google s finicky Chromecast Also keep in mind that it s easier to mount a lightweight home theater projector and DLP models are usually lighter than those with LCD tech Some projectors are noisier than others and usually the more you spend the less noise you get Many of the new K DLP projectors when operating in K mode are particularly noisy There s one other cool thing if you have a portable projector or even one that is relatively easy to take down and put up you can take it outside for magical night screenings under the stars HDR and resolutionAs related to projectors these things could each take up an entire article In fact they have ーfor a deeper dive take a look at Projector Central s excellent takes on HDR and resolution On the resolution front only expensive projectors have native K resolution indeed most movie theaters still use K projectors for various reasons However there are many relatively inexpensive DLP projectors that use pixel shifting to attain K resolution That system emits each pixel four times while moving it to the correct position for a K image all in less than th of a second As such it puts as many pixels on the screen in the same amount of time as a K native projector ーand visually it performs nearly as well On the other hand Epson s LCD “K enhanced projectors also have p native resolution but the image is just shifted twice not four times So those projectors are not K natively or otherwise but do produce double the pixel count of a p projector If you really want a K native projector you ll have to pay two of the cheapest ones are Sony s VPL VWES and JVC s DLA NX HDR is a very different animal on projectors compared to TVs As mentioned projectors can t produce anywhere close to the amount of light required nits to qualify as true HDR Rather they use a technique called tone mapping to fit the entire HDR gamut into a lower brightness range For that reason among others almost all projectors only support HDR Only one uses Dolby Vision the Xiaomi Laser Cinema only available officially in China and just a couple of models work with Samsung s HDR ーand those are Samsung s own Premiere K models However most support a wider bit color gamut that allows for superior color reproduction Samsung OpticsIf you re mounting a short or long throw projector between five and feet you might need to consider the zoom range and whether the projector has a lens shift option A decent zoom range will make it easier to mount the projector where you want with the screen size that you want Lens shift meanwhile is used if the projector is mounted higher or lower relative to the screen than recommended by the manufacturer or any horizontal distance off center That creates a trapezoidal shaped image but by dialing in some lens shift you can optically square it up Otherwise you might have to use a quot keystone correction quot which digitally stretches or shrinks part of the image resulting in noticeable distortion or pixel artifacts Digital correction might not work in gaming modes either for some projector models GamingIf you re interested in a gaming projector you ll want to look up the refresh rate and input lag figures Some new projectors from Viewsonic Optoma and others offer up to Hz p refresh rates and input lag settings down to or milliseconds However some projectors designed more for home entertainment have very poor input lag and refresh rates at just Hz Portable projectorsFinally portable projectors have become popular enough to merit discussion this year They re relatively cheap compact and portable and can run on batteries making them ideal for entertainment outside or while camping These outdoor projectors are not nearly as bright as others of course but are more designed for a fun night of entertainment under the stars Engadget picksAs with previous updates I m dividing projectors into ultra short throw and long throw categories As mentioned ultra short throw models have rapidly established themselves in the market due to the extra performance and convenience and all manufacturers sell at least a couple of models Within the ultra short throw category We ll compare two price categories under and with three projectors each In the long throw category we re again looking at projectors under and with three products in each range Finally we ll take a look at the best portable projectors Best ultra short throw projectors under LG CineBeam HUQLG s nice looking HUQ is the new king of ultra short throw UST projectors due to the picture quality tech on offer and reasonable price With a hour laser light source it delivers ANSI lumens along with accurate colors across percent of the DCI P gamut enough for most HDR content And speaking of that it supports both HDR and HLG along with frame by frame tone mapping Rival models offer similar specs but the HUQ trumps them in sound and technology The watt way stereo speakers have a great sound quality on their own but you can supplement them with Bluetooth speakers from LG and nearly any other brand to create surround sound The standout feature though is LG s webOS smart TV capabilities that give you Netflix Disney Amazon Prime Apple TV and other apps all with full K HDR support and surround sound including eARC output for Dolby Atmos and lossless audio It also supports HDMI and better still full K x rather than just UHD Optoma CinemaX POptoma s CinemaX P made our list last year but it s one of the best projectors now because the price has dropped considerably It delivers lumen brightness impressive contrast ratio and accurate colors with percent DCI P coverage It s not quite as sharp as the pricier projectors as it uses TI s inch rather than inch DLP tech though you ll still get a near K image The CinemaX P may also better match your living room decor as it comes in white rather than dark grey like the P The watt NuForce Dolby Digital soundbar is one of the best on any ultra short throw projector as well On the downside it does offer apps but they re not as good as you ll find on say Google s Chromecast BenQ ViBenQ s first UST laser projector is at the top end of the price scale at but it offers some impressive capabilities Light output is a bright ANSI lumens and it delivers a full percent DCI P coverage for as good an HDR experience as you can get on a projector You also get a Filmmaker Mode to see colors as the directors intended It s powered by Android TV so you get all the streaming services and apps you want along with apps games and more The downside is the lack of decent speakers as it only offers dual watt speakers with clear sound but limited bass Epson EpiqVision Ultra LSWIf you re okay with p projection Epson s EpiqVision Ultra LSW is a very interesting option because of the design excellent sound built in Android TV and extreme ANSI lumen brightness That allows for a wide color gamut with no rainbow effect excellent connectivity and very good sound without the need to buy a soundbar or surround sound system Best of all it s priced at just making it one of the cheaper short throw projectors out there Best ultra short throw projectors under Samsung Premium LSPTUltra short throw projectors are a hot enough entertainment category that Samsung decided to re enter the market with two high end models as part of its Lifestyle TV series The LSPT is the premium model and it certainly brings some premium specs With separate red green and blue lasers it covers percent of the full Rec color range percent of DCI P ーsomething we ve rarely if ever seen on any TV or even pro monitor It delivers a very bright lumens and a ANSI contrast ratio As it uses TI s higher resolution inch DLP chip with pixel shifting you get as close as you can to true K without investing in a native K projector Finally the LSPT is the first projector on the market rated for HDR ーSamsung s answer to Dolby Vision On top of all that the LSPT delivers watts of audio using Samsung s Acoustic Beam technology while offering Samsung s well regarded Tizen powered Smart TV platform Epson EpiqVision Ultra LSIf you need the brightest possible image Epson s LCD powered EpiqVision Ultra LS delivers It s rated at up to lumens making it one of the brightest ultra short throw projectors in any price range It also supports HDR modes in HDR and HLG and is sold with both inch and inch ALR screens making the price effectively lower The main drawback is that it only offers double the pixels of p rather than four times like competing DLP tech It also offers a relatively weak watt built in speaker system HiSense LGThis is HiSense s new flagship UST that uses a tricolor laser to achieve high brightness ANSI lumens and an incredible percent BT HDR coverage topping even Samsung s formidable LSPT It has a powerful W Dolby Atmos sound system and built in Android TV with Google Assistant and Alexa Best of all that price includes a inch ALR Daylight screen or for an extra you can get it with a inch ALR cinema screen Best projectors under Viewsonic PX KThere are very few K projectors available under and Viewsonic s PX K is one of the most recent For the money it offers impressive performance You get K HDR with lumens of brightness via TI s inch DLP chip More importantly for gamers you can get a p signal at up to Hz with a millisecond input lag time The drawbacks are a limited x optical zoom so you ll need to make sure it fits in your space BenQ HTAFor around the BenQ HTA is still one of the best budget p projectors It delivers where it counts with the best contrast ANSI and color accuracy in its class and is reasonably bright as well with lumens in quot vivid quot mode On top of that it comes with a x zoom and vertical lens shift option for maximum installation flexibility The drawbacks include slightly excessive fan noise rainbow effect and red tinted D Optoma HDXIf you re looking to spend a little less on a budget projector the Optoma HDX is your best option Using DLP tech it delivers p at up to lumens with excellent brightness color accuracy contrast and black levels You also get decent millisecond input lag for gaming The drawbacks are a single HDMI port x optical zoom and poor built in audio Best projectors under BenQ HTiBenQ s K HTi is an update to last year s HT but with a huge addition Android TV With that you get multi platform wireless projection from Android and iOS devices via Chromecast or Airplay ーa huge plus compared to rival projectors As before it offers reference quality K color reproduction in both HDR and SDR that s a match for projectors costing triple the price Contrast is excellent thanks to the dynamic iris though brightness is limited to lumens It has a x zoom and vertical lens shift option plus a surprisingly good built in speaker The fan noise is still present but less than before If brightness is more important than picture quality take a look at BenQ s TKi instead It also comes with Android TV but delivers far more brightness lumens in exchange for less color accurate picture quality Optoma UHDFor extra brightness and speed for gaming the answer is Optoma s all new K capable UHD It cranks the lumens up to and like the Viewsonic PX K offers Hz gaming at p with one of the lowest latency figures we ve seen yet in a projector at milliseconds Otherwise you can do K Hz gaming with milliseconds of lag which is very quick for K It s optimized more for gaming than entertainment unlike BenQ s HTi but it can still handle HDR and HLG It supports both zoom albeit just x but also vertical and horizontal lens shift Epson Home Cinema K ProEpson s Home Cinema K Pro is the Cadillac of under K home projectors thanks to features like lumen brightness dynamic iris and motorized zoom x focus and lens shift This Epson projector delivers in picture quality too covering percent of the DCI P color space in cinema mode with both HDR and HLG It also offers near K quality using x LCD image chips with pixel shifting The drawbacks are lack of support for Hz K due to the HDMI ports If you need that want to pay a bit less and don t care about the motorized focus Epson s Home Cinema K Pro is the way to go It offers similar features like HDR and HLG but supports K p thanks to the HDMI b ports There s no motorization and the zoom drops to x but it supports generous tilt shift and zoom ranges Best projectors under Epson Home Cinema LS laserFans of Epson s LCD projectors will be interested in this model which received a big update in the form of a laser light source That bumps the brightness to ANSI lumens and the three p LCDs use a pixel shifter to quadruple the resolution to something close to true K It offers very accurate colors with HDR and HLG capability but is also great for gaming thanks to the Hz refresh rate millisecond input lag and HDMI support You also get a way motorized lens scene adaptive correction and more for Optoma UHZLVOptoma s UHZLV also uses a long lasting laser light source to deliver a lumen image much brighter than any lamp powered projector It also delivers true K resolution up to p thanks to the TI inch DLP chip The extra brightness and contrast make it ideal for HDR or HLG content It also comes with desirable features for a long throw laser projector like a x zoom and vertical lens shift LG CineBeam HUPW KSpeaking of long throw laser projectors LG s CineBeam HUPW is another excellent pick at a much lower price point There are some compromises as the laser light pushes out a lower lumens that s still a lot and it has a smaller inch DLP chip that delivers slightly lower perceived resolution However it has dual blue and green lasers which help it deliver accurate HDR colors with an excellent percent DCI P coverage It also offers a x zoom with lens shift and an HDMI port that allows for K at p with up to bit color depth It comes with LG s webOS so it supports Amazon Prime Netflix Hulu and other streaming services without the need for a dongle Sony VPL VWESIf you re looking for a true native K projector Sony s VPL VWES is the least costly option out there It s by far the sharpest K projector in this roundup thanks to Sony s proprietary K SXRD native DCI K x panels It also delivers extremely accurate colors with percent DCI P coverage and HDR HLG support You also get niceties like a zoom lens with powered zoom lens shift and focus The main drawback is a relatively dim lumen brightness but it s a top pick if picture quality is paramount above all Best budget portable projectorsXgimi MoGo ProXgimi is a relatively new brand but has started to gain traction thanks to its lineup of portable projectors The best mini projector is the MoGo Pro which can be powered by a battery with two hours of playtime and is small enough to fit in a backpack But this mini projector still delivers a detailed and reasonably accurate p image while offering automatic focus and vertical keystone adjustment It even comes with Android TV giving you all the streaming options you can need all for BenQ GSThis model is designed specifically for outdoor entertainment so it s battery powered and splash and shock resistant making it your best bet for backyard movie nights or for watching sports events camping and more It s also one of the brightest portable projectors out there and has a battery life of up to three hours This outdoor projector only delivers p resolution but it does come with a streaming app in the form of Aptoide TV Anker Nebula Solar HDThis p projector has a pretty rich feature set considering the price including a battery This portable projector delivers lumens for reasonably bright outdoor use has a reasonably powerful xW speaker system with Dolby Digital Plus comes with Android TV and has a built in stand for easy adjustment FAQsAre K projectors better Yes because higher resolution is more noticeable on larger screens so K is particularly useful with projectors since they beam images up to inches in size That being said brightness and contrast are more important Is a projector better than a TV Projectors can provide a more immersive experience thanks to the large screen but they re not necessarily “better Since you usually have to dim the lights with a projector TVs are superior for everyday use Is lumens bright enough for a projector Yes lumens is easily bright enough even with some ambient light in the room However the image will still be hard to see with the windows open on a bright day Should I get a K or p projector That depends on your budget and needs If your budget is below look for a p projector with the best brightness and contrast Between you ll need to weigh whether brightness or K resolution is most important Above that choose the brightest K projector you can afford What are the best projectors in daylight The best projectors in daylight are ultra short throw UST models as they have the brightest and sharpest image However they generally cost more than This article originally appeared on Engadget at	2023-07-05 14:45:34
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