Will these colours scan?
Pick module and background colours. The ratio updates live, and the code on the right is drawn in exactly those colours.
17.7: 1
pass · ≥ 4.5safe everywhere
pass · ≥ 3.0good light only
pass · polaritydark on light
Questions
- What ratio do I need?
- 4.5:1 is safe everywhere; 3:1 works in good light on matte stock.
- Can modules be lighter than the background?
- Most phones read inverted codes; many older scanners do not.
- Does colour matter or just contrast?
- Contrast. Red on black can pass a phone and fail a laser scanner.