Skip to content

v1.0.28

Choose a tag to compare

View all tags
@github-actions github-actions released this 15 Jul 20:33
· 23 commits to main since this release
v1.0.28
63fee79

1.0.28.0 - 2026-07-16

  • Made 1:1 zoom use the original image resolution: selecting Actual Size now upgrades the current D3D image or Ultra HDR primary image from the capped preview decode to a full-resolution texture before calculating zoom, while normal viewing and adjacent preloading retain their bounded decode sizes. The renderer also tracks decode detail so returning to an image or resizing the window cannot silently reuse an undersized texture.

Install

  1. Download HdrImageViewer-1.0.28-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.

Optional Format Tools

Most common formats work out of the box. JPEG XL preview and some HDR export formats use external command-line tools when they are available.

Install optional tools with MSYS2 UCRT64:

winget install --id MSYS2.MSYS2 --source winget
C:\msys64\usr\bin\pacman.exe -Syu --noconfirm
C:\msys64\usr\bin\pacman.exe -S --needed --noconfirm mingw-w64-ucrt-x86_64-libjxl mingw-w64-ucrt-x86_64-libavif mingw-w64-ucrt-x86_64-libheif

Restart HDR Image Viewer after installing. The app auto-detects tools in C:\msys64\ucrt64\bin and also checks PATH.

  • JPEG XL preview: jxlinfo.exe and djxl.exe from libjxl.
  • JPEG XL / AVIF / HEIC HDR export: cjxl.exe, avifenc.exe, and heif-enc.exe when installed.
  • Ultra HDR JPEG export: advanced users can place ultrahdr_app.exe on PATH.
Assets 3
Loading