screenshot-tag-colorspace = no, not working as expected

mpv Information

mpv v0.39.0-781-gf94b44c8e Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
 built on Feb 16 2025 00:06:00
libplacebo version: v7.350.0 (v7.349.0-30-g056b852-dirty)
FFmpeg version: N-118471-ga50d36b5f
FFmpeg library versions:
   libavcodec      61.33.102
   libavdevice     61.4.100
   libavfilter     10.9.100
   libavformat     61.9.107
   libavutil       59.56.100
   libswresample   5.4.100
   libswscale      8.13.100

Important Information

- Platform version: Windows 10
- GPU model, driver and version: Nvidia RTX 4080, DCH, 566.36
- Source of mpv: sourceforge
- Latest known working version: no idea
- Issue started after the following happened: no idea

Reproduction Steps

Set conf to yes or no and save a screenshot using sample files.

Expected Behavior

Expected behavior is the screenshot-tag-colorspace = no & screenshot-tag-colorspace = yes but with metadata stripped using optipng -strip all should look the same but they do not.

I just want to set screenshot-tag-colorspace = no so I don't have to strip metadata every time I take a screenshot to get proper viewing.

Actual Behavior

Colors are wrong, here is a comparison: https://slow.pics/c/eFYXWAY2

Images in order:

1. Raw window capture using snipping tool (color is correct)
2. screenshot-tag-colorspace = no (color is wrong)
3. screenshot-tag-colorspace = yes (color is wrong)
4. screenshot-tag-colorspace = yes but meta stripped using optipng (color is correct)

Slow.pics comparison not using optimize feature as it fixes the problem on the screenshot-tag-colorspace = yes image.

Changing any other settings:

screenshot-format = png
screenshot-sw = no
screenshot-high-bit-depth = no
screenshot-tag-colorspace = yes
screenshot-png-compression = 4

Results in still incorrect colors no matter what.

Log File

output.txt

Screenshot Metadata:

screenshot-tag-colorspace = yes : https://pastebin.com/raw/Ga8n3a2P

screenshot-tag-colorspace = no : https://pastebin.com/raw/B1Kqa3w5

screenshot-tag-colorspace = yes but metadata has been stripped using optipng -strip all : https://pastebin.com/raw/YDeUvzqW

Sample Files

Using this mpv conf: mpv.txt
Using this sample video: https://files.catbox.moe/gnytqy.mkv

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 color difference with the supplied mpv configuration, sample video, and output.txt on Windows 10. Compare the screenshot metadata for both screenshot-tag-colorspace settings and the optipng-stripped result; done means identifying why the colors differ and making the no setting produce the expected colors without manual metadata stripping.