Use scRGB to enable wide gamut display on SDR

[Headcrabed]

Currently, most GPU drivers have very limited surface colorspace choice under SDR+Windows. Is it possible to use scRGB to display wide gamut content or tonemapped HDR content under SDR ACM on Windows?

[kasper93]

--target-trc=scrgb

[Headcrabed]

This is Windows limitation in SDR mode. They clip anything > 80 nits. And mpv outputs SDR even at 203 nits. You can try setting --target-peak=80, but in practice scRGB is usable on HDR output.

I think there's still something wrong... After doing this, output result seems still limited to sRGB..

[Headcrabed]

But generally I wouldn't recommend to output scRGB, when Windows is not in HDR mode. It simply doesn't support anything outside standard sRGB,

Nope, by forcing Edge to scRGB, I can see difference between wide gamut and sRGB images.

[kasper93]

But generally I wouldn't recommend to output scRGB, when Windows is not in HDR mode. It simply doesn't support anything outside standard sRGB,

Nope, by forcing Edge to scRGB, I can see difference between wide gamut and sRGB images.

Patches welcome. DWM is clipping gamut, feel free to debug it and figure out what is supported.

[Headcrabed]

Patches welcome. DWM is clipping gamut, feel free to debug it and figure out what is supported.

Ok I'll create an issue to track this first. Since I may not have time to dig into this so that someone else could take over.

[Headcrabed]

Issue here: #17850