For the graphic designer-turned-card sharp, prepare to drool. Forget about playing the A (ace), the J (jack), the Q (queen) or the K (king). Consider playing the C (cyan), the M (magenta), the Y ...
RGB color is the mainstream in tools and software on the web, CMYK is the mainstream in printed matter, but the first three primary colors learned at school are RYB color model of red · yellow · blue.