Color Depth

Color depth measures colors per pixel in bits: 1-bit = 2 colors, 8-bit = 256, 24-bit = ~16.7 million. QR codes are inherently 1-bit - each module is binary dark/light, enabling fast scanner recognition. Gray or intermediate colors cause detection ambiguity.

Design QR codes use full color (24-bit+) for module customization while maintaining dark/light contrast. Save QR codes as PNG (lossless) or SVG (vector), not JPEG (lossy compression blurs module boundaries).