It helps to remember that: 1. #RRGGBB 2. B + G = Cyan 3. R + B = Magenta 4. R + G = Yellow 5. Equal amounts of all three channels = Gray 6. #000000 = Black 7.

It helps to remember that: 1. #RRGGBB 2. B + G = Cyan 3. R + B = Magenta 4. R + G = Yellow 5. Equal amounts of all three channels = Gray 6. #000000 = Black 7. #FFFFFF = White Think of the rgb color space as a cube, with each of Black, White, Red, Green, Blue, Cyan, Magenta, Yellow on the vertices. Then you define any hex color as point somewhere in this cube and it's pretty easy to imagine what it'll look like.