[Wojtek Tymicki]

From what I read about the new iMac P3 display, calibration will not fix the issue, because “oversaturation” is affecting only particular software (chrome, vlc premiere pro) that doesn’t support the P3 gamut.

“One of the challenges of wide gamut displays is that the colors in untagged objects (objects without a color profile) can appear oversaturated. This can happen when the color values of untagged objects are defined in a smaller color space such as sRGB, which is usually the case. When those untagged color values are displayed on a larger gamut display, if their gamut is simply scaled up to match the larger gamut the color values can end up further out than they should be in the larger color space, appearing oversaturated.”

https://blog.conradchavez.com/2015/10/26/a-look-at-the-p3-color-gamut-of-the-imac-display-retina-late-2015/

This is interesting article covering the issue of oversaturation.

Unfortunately it doesn’t offer any other solution than to get external display…

Funny thing. I opened the clip in After Effects and I set project working space to sRGB and that fixed the problem. But that is AE. PP doesn’t offer to my knowledge color management