10-bit color and 8-bit color are common idioms in the video industry to refer to 30-bit pixels and 24-bit pixels. It makes more sense in video where one often

10-bit color and 8-bit color are common idioms in the video industry to refer to 30-bit pixels and 24-bit pixels. It makes more sense in video where one often uses the YCrCb colors space where the color components (Cr Cb) are often sampled at half the rate of the luma components. In this case, 10-bits corresponds to 20-bits per sample point.