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If the content-type of the image is not in INLINE_MIME_TYPES, then we do not expect browsers to be able to display it. This behaviour is particularly confusing because the thumbnail will render properly, since that will be in the more widely-supported WebP format, but the lightbox will show a broken image. In these cases, generate a high-resolution (4032x3024) "thumbnail" which clients can choose to use instead. This thumbnail format is not in the listed in the server's advertised thumbnail size list, because it is not reliably generated for every image. The transcoded thumbnail format is set on the `img` tag if it is generated, and the original content-type is always passed to the client, so it can decide how or if to render the original image. This content-type is as the _original uploader_ specified it, so may be incorrect. The transcoded image is not animated, even if the original was. HEIC files can nominally be animated, but in testing libvips was not able to correctly recognize them as such. TIFF files are parsed as being "animated," with one page per frame; this is of dubious utility, so we merely transcode the first page. Always generating a static transcoded image serves to also limit the computational time spent. THUMBNAIL_OUTPUT_FORMATS is switched to be a tuple to ensure that it is not accidentally mutated.
Zulip overview
Zulip is an open-source team collaboration tool with unique topic-based threading that combines the best of email and chat to make remote work productive and delightful. Fortune 500 companies, leading open source projects, and thousands of other organizations use Zulip every day. Zulip is the only modern team chat app that is designed for both live and asynchronous conversations.
Zulip is built by a distributed community of developers from all around the world, with 74+ people who have each contributed 100+ commits. With over 1000 contributors merging over 500 commits a month, Zulip is the largest and fastest growing open source team chat project.
Come find us on the development community chat!
Getting started
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Contributing code. Check out our guide for new contributors to get started. We have invested in making Zulip’s code highly readable, thoughtfully tested, and easy to modify. Beyond that, we have written an extraordinary 150K words of documentation for Zulip contributors.
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Contributing non-code. Report an issue, translate Zulip into your language, or give us feedback. We'd love to hear from you, whether you've been using Zulip for years, or are just trying it out for the first time.
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Checking Zulip out. The best way to see Zulip in action is to drop by the Zulip community server. We also recommend reading about Zulip's unique approach to organizing conversations.
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Running a Zulip server. Self-host Zulip directly on Ubuntu or Debian Linux, in Docker, or with prebuilt images for Digital Ocean and Render. Learn more about self-hosting Zulip.
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Using Zulip without setting up a server. Learn about Zulip Cloud hosting options. Zulip sponsors free Zulip Cloud Standard for hundreds of worthy organizations, including fellow open-source projects.
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Participating in outreach programs like Google Summer of Code and Outreachy.
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Zulip is distributed under the Apache 2.0 license.