QR code colors and contrast: what scans and what doesn't
· 6 min read
Which QR code colors actually scan? The rules for background color, contrast, inverted codes, and the red-ink trap, drawn from the QR spec and scanner source code.
Branded QR Codes
How big can a logo be on a QR code before it stops scanning?
· 4 min read
Standard logo QR codes cap out around 20-25% coverage. Here's the error-correction math behind that ceiling, and how whole-code QR generation removes it.