JPEG Ultra HDR / JPEG_R image suport#700
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Install `libheif-plugin-libde265` to allow ImageMagick to properly process HEIF/HEIC files, which are commonly used for HDR content. Adjust HDR preview integration tests to remove assertions on specific image profiles, making them more robust to variations in metadata output across different HDR image formats and processing steps.
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Added
Added JPEG Ultra HDR / JPEG_R image preview generation. For supported JPEG images with gain maps, the server now creates a second set of JPEG previews with gain maps and stores them as HDR-specific preview variants.
Attachments with generated HDR previews expose
meta.hdr: true, and clients can request the HDR version withGET /v4/attachments/:id/image?variant=hdr. Thevariant=hdrquery parameter is safe to send for any image attachment: if an HDR preview is not available, the endpoint falls back to the regular SDR preview. HDR preview responses includevariant: "hdr".