Color comes from two additional "chroma planes", which are also monochrome images that are compressed the same way. Example of an image split into three planes

Color comes from two additional "chroma planes", which are also monochrome images that are compressed the same way. Example of an image split into three planes: https://upload.wikimedia.org/wikipedia/commons/d/d9/Barns_grand_tetons_YCbCr_separation.jpg https://upload.wikimedia.org/wikipedia/commons/d/d9/Barns_gr... Often the chroma planes are stored at a smaller resolution and scaled up when decoding, since details in chroma don't matter as much as details in brightness.