Good discussion! So, here's for you my complete thought process before I posted that short comment.
Arkady Bolotin wrote:Then again, the xvYCC color standard allows reproducing colors beyond the sRGB Color gamut, that is, further from the white point! Therefore, the record shot in the xvYCC would be perceived like someone artificially increased the footage’s color saturation!
True, but only for those colors which are illegal in sRGB - they would ordinarily be clipped, and with xvYCC the saturated reds are redder, the saturated yellows yellower, and so on. As jbeale pointed out, the color properties of sRGB-legal colors are unchanged. Again, from BT.709 to xvYCC, only the saturated colors are even more saturated whereas the pale (unsaturated) colors do not change.
Arkady Bolotin wrote:Therewith, there’s a simple clue showing whether the footage was saturated or not. This is the reddishness of gray patterns and human skin colors in the image. If saturation is applied they all would be strongly tinged with red. But look closely at the last video I posted: all the grey colors are truthfully grey, you cannot find any color shifting. It’s just more colors, that’s it!
Indeed, I pay extreme attention to skin tones. So my first reflex was to check the skin of that woman on the far right at the end of your video. The skin tone is good, so I thought: excellent, these's more red in flowers and more green in trees, and yet the skin tone is preserved. Mission accomplished! But the grounds do look a bit yellowish/reddish sometimes.
Then, in a second step, I wondered: what we really need is an A/B comparison, because without a reference it's difficult to judge what shifts, and what shifts not. So I looked again at your side-by-side comparison (first post, Color test.jpg), and there, I'm sorry, but everything shifts: bluer sky, redder flowers, the stone/sand ground and the house wall turn yellow/red. The ugly face of too much color saturation across the whole picture.
Maybe it's linked to how you export the video and the still image, how Vimeo processes the video, how the browser displays the video and the still image... It's a complex chain of components, and we control barely nothing really. We need to make sure that your export processes map sRGB to 16-240 (or is that 235) and use the extra values for xvYCC, and so do Vimeo and all the software components. Heck, what do we know... I truly have no idea whether all that workflow can support xvYCC. Probably not: computer monitors and operating systems and software components have been set to the sRGB color space for years, and if you need to change that I don't think it can be transparent.
I don't know, this is confusing.