png image saved in rec.2020 looks washed out

mpv Information

mpv v0.40.0 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Jan  1 1980 00:00:00
libplacebo version: v7.351.0
FFmpeg version: 7.1.1
FFmpeg library versions:
   libavcodec      61.19.101
   libavdevice     61.3.100
   libavfilter     10.4.100
   libavformat     61.7.100
   libavutil       59.39.100
   libswresample   5.3.100
   libswscale      8.3.100

Other Information

- Linux version: NixOS (tracking nixpkgs-unstable)
- Kernel Version: 6.15.5
- GPU Model: 8700 XT
- Mesa/GPU Driver Version: Mesa 25.1.5
- Window Manager and Version: niri 25.05.1
- Source of mpv: nixpkgs
- Latest known working version: N/A
- Issue started after the following happened: N/A

Reproduction Steps

Export a PNG image with Krita, make sure to select "Save as HDR image (rec 2020)" when saving:

Open the resulting image with mpv.

Expected Behavior

Image looks the same as it looks in krita.

Actual Behavior

Image appears washed out.

Log File

output.txt

Sample Files

No response

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

Start by reproducing the issue with a Krita-exported PNG using “Save as HDR image (rec 2020)” and inspect output.txt alongside the reported mpv, libplacebo, and FFmpeg versions. Compare the rendering in mpv with Krita; done means the rec.2020 PNG no longer appears washed out.