[old_tv_nut]

"The thing is my, my iPad can display WCG P3 and our OLED TV has P3 color space with a Chrome web browser so we can view my website photos on a large screen. The photos look overly saturated on the front interface, (RGB) but when opened to full resolution, they are displayed in a different color space. (P3)"

I think a correct statement is that your OLED is always displaying in P3 space. When going in RGB, it is just taking the RGB values of the sRGB input and applying them to the P3 primary colors, thus increasing the saturation. But when you expand to full screen, it is converting the sRGB values to P3. This means decreasing the saturation in the signal the right amount to compensate for the increase due to the P3 primary colors.

This is similar to what happens on my computer monitors, one sRGB and the other wide gamut. Viewing an sRGB jpg in Chrome on the sRGB monitor gives natural colors, but if I move the Chrome window to the wide gamut monitor, the colors are oversaturated, because Chrome does not do anything to take account of the monitor profile. But, if I open that same sRGB jpg in Photoshop, it shows the correct colors whether the Photoshop window is on either monitor. In fact, if you slowly move the Photoshop window from one monitor to the other, as soon as it passes the 50% split, the rendition changes to be correct on whichever monitor has the majority of the image area.