v1.0.33

1.0.33.0 - 2026-10-02

• Added HEIC / AVIF ISO Gain Map export for single images, crops, and batch queues, with monochrome/RGB maps and verified HDR readback.
• Fixed odd-dimension ISO Gain Map decoding and sRGB transfer tagging; automatic SDR bases are now correctly labeled Display P3.
• Fixed the ImageMagick EXR fallback applying an extra gamma conversion to scene-linear samples.
• Updated the pinned x64 codec stack to libultrahdr 2.0.2, libjxl 0.12.0, libavif 1.4.2, libheif 1.23.5, libde265 1.1.3 and OpenEXR 3.5.1, with updated supporting libraries and x265 4.3 multilib. Ultra HDR retains JPEG output with both XMP and ISO metadata.
• Added checksum-verified codec restoration/build scripts, runtime dependency manifests and rollback backups. CI and release builds use the same codec lock. Native runtime copies no longer keep older executables simply because their file timestamps are newer.
• Shared the assembly's native resolver between EXR and JPEG XL, supporting both MSVC and MinGW JPEG XL DLL names. Added application-level PQ/HLG export/decode and monochrome/RGB Ultra HDR round-trip checks.

Install

1. Download HdrImageViewer-1.0.33-win-x64-portable.zip.
2. Extract the zip to a normal folder, for example C:\Apps\HdrImageViewer.
3. Run HdrImageViewer.exe.

Requires the x64 .NET 10 Desktop Runtime and Windows App Runtime 2.2. No certificate installation is required for the portable zip. Windows may show a SmartScreen warning because this GitHub build is unsigned.

Recommended Install

For most users, install the Microsoft Store version so Windows handles signing and updates.

Bundled Format Tools

The x64 portable build includes the pinned JPEG XL, AVIF, HEIC, OpenEXR and Ultra HDR codecs and command-line tools. No separate MSYS2 installation is required for these formats.

JPEG Ultra HDR and HEIC / AVIF ISO Gain Map exports support monochrome and RGB gain maps. Codec versions and source checksums are recorded in eng/codecs.lock.json.