Here's a video that shows the concept. Each frame shows the allowable colors for a particular brightness in Rec. 709 YCbCr space. https://www.w6rz.net/chromaci

Here's a video that shows the concept. Each frame shows the allowable colors for a particular brightness in Rec. 709 YCbCr space. https://www.w6rz.net/chromacity.mp4 https://www.w6rz.net/chromacity.mp4