Issues

• Apple gain-map JPEGs decode brighter than Apple's own decoder (headroom unit, headroom source, gain formula, map curve)

  google/libultrahdr#501 · Filter by author ternarybits opened on Oct 15, 2026

• Colored noise and edge artifacts in RGB gain maps

  google/libultrahdr#487 · Filter by author gregbenz opened on Sep 24, 2026

• Use 4:4:4 for multichannel AVIF and HEIF gain maps

  google/libultrahdr#485 · Filter by author gregbenz opened on Sep 24, 2026

• Preserve user and application XMP metadata across encodes (JPEG/HEIC/AVIF)

  google/libultrahdr#469 · Filter by author DichenZhang1 opened on Sep 11, 2026
  3

• Request: Support API-4-style AVIF/HEIF gain-map encoding

  google/libultrahdr#454 · Filter by author gregbenz opened on Aug 16, 2026
  3

• Request: Support HDR base image encoding for AVIF

  google/libultrahdr#453 · Filter by author gregbenz opened on Aug 16, 2026

• Request: "API-5" to transcode between supported formats

  google/libultrahdr#398 · Filter by author gregbenz opened on Jun 9, 2026

• Benchmark for mobile ARM CPU/GPU

  google/libultrahdr#387 · Filter by author sinwel opened on Mar 30, 2026

• CTest failed on s390x architecture in Fedora 44

  google/libultrahdr#382 · Filter by author topazus opened on Jan 25, 2026
  2

• Request: support for JXL gain maps

  google/libultrahdr#378 · Filter by author gregbenz opened on Jan 17, 2026

• Provide a Maven repository for the Java binding

  google/libultrahdr#371 · Filter by author cmahnke opened on Sep 9, 2025

• Should the aux image include an ICC profile?

  google/libultrahdr#365 · Filter by author gregbenz opened on Aug 12, 2025
  2

• Strange inexplicable banding

  google/libultrahdr#357 · Filter by author jonsneyers opened on Apr 29, 2025
  8

• Request: ppm or png input/output

  google/libultrahdr#353 · Filter by author jonsneyers opened on Feb 27, 2025
  1

• Missing flag in pkgconfig file

  google/libultrahdr#289 · Filter by author kmilos opened on Sep 25, 2024
  2

• Request: Support prebuilt binaries for Major Linux distributions

  google/libultrahdr#20 · Filter by author ganadist opened on Oct 13, 2023
  5