RGB

RGB represents colors by mixing Red, Green, Blue light (additive color). Displays use RGB with each channel at 0-255, producing ~16.7 million colors. Standard QR codes use black (0,0,0) and white (255,255,255) for maximum contrast.

Color QR codes need sufficient RGB contrast between dark modules and light background. For print, RGB converts to CMYK, which may shift colors - specify CMYK directly for printed QR codes.