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AMD, Nvidia and Intel all have Hue/Saturation sliders in their control panels. These settings are specific per-monitor and don’t appear in screenshots, so they are implemented in hardware (or at the very least, in the display driver). However, they’re also separate from the gamma table, as changing the values does not affect the gamma table, and setting/resetting the gamma table with saturation at zero (greyscale) shows the relative grey values changing, but the display stays greyscale.
So with all of the above in mind, would it be possible to investigate how these settings are changed, if they are even device-specific or something that works the same across GPU vendors in Windows, ultimately with the goal of allowing owners of wide gamut displays (Adobe RGB or DCI-P3, essentially anything >sRGB) to easily switch between saturation-limited modes that emulate smaller gamuts like sRGB for simple browsing, document editing and legacy applications that assume everything is sRGB, and the full monitor gamut for colour managed applications like Photoshop.
(NB: It actually took me until today to realise that the hardware lookup table as used by calibration software is a 1DLUT and not a 3DLUT, so complex transformations like gamut mapping are impossible with it. Shows how much I know 😉 )
AMD, Nvidia and Intel all have Hue/Saturation sliders in their control panels. […] However, they’re also separate from the gamma table
Digital vibrance and hue (nVidia) indeed seem to operate independent from the gamma tables.
would it be possible to investigate how these settings are changed, if they are even device-specific or something that works the same across GPU vendors in Windows
It’s all proprietary. For gamut limiting, the controls are also too crude.
[…] allowing owners of wide gamut displays (Adobe RGB or DCI-P3, essentially anything >sRGB) to easily switch between saturation-limited modes […]
Many wide-gamut monitors offer gamut limiting/emulation modes in their OSD menu.
