Color · Color Models
RGB
also known as red green blue
RGB builds colors by combining red, green, and blue light at varying intensities, usually from 0 to 255 per channel. Because it adds light, more of every channel moves toward white and zero of all channels is black. It is the native model for anything that emits light, such as monitors, phones, and TVs.
Don't confuse it with
RGB is additive (mixing light, used on screens) and CMYK is subtractive (mixing inks, used in print). Full RGB makes white; full CMYK ink makes near-black. Designing in the wrong one causes color shifts when printing.
In the wild
rgb(255, 0, 0) is pure red on a screen.