The logic applies for any given resolution or color set, I'm just using full hd here because is the most common (same for color) and enough to display a pretty

The logic applies for any given resolution or color set, I'm just using full hd here because is the most common (same for color) and enough to display a pretty detailed picture, the core idea here is that no matter what kind of image you are trying to make, it is already constrained into a finite set of combinations.