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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. |
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| .. | ||
| include | ||
| api-doc-template.md | ||
| api-keys.md | ||
| changelog.md | ||
| client-libraries.md | ||
| configuring-python-bindings.md | ||
| construct-narrow.md | ||
| create-scheduled-message.md | ||
| create-stream.md | ||
| deploying-bots.md | ||
| group-setting-values.md | ||
| http-headers.md | ||
| incoming-webhooks-overview.md | ||
| incoming-webhooks-walkthrough.md | ||
| index.md | ||
| installation-instructions.md | ||
| integrations-overview.md | ||
| message-formatting.md | ||
| missing.md | ||
| non-webhook-integrations.md | ||
| outgoing-webhooks.md | ||
| real-time-events.md | ||
| rest-error-handling.md | ||
| rest.md | ||
| roles-and-permissions.md | ||
| running-bots.md | ||
| send-message.md | ||
| sidebar_index.md | ||
| writing-bots.md | ||