Shelf impact is a completely different design constraint from screen legibility. On shelf, you have approximately 300ms of moving, peripheral vision to capture attention. High contrast (light/dark) and brand color consistency beat fine typographic detail every time in the peripheral attention zone. The color that 'reads' from 10 feet in a glance is your packaging's most critical design decision — and it must be optimized for peripheral, not foveal, vision.
CMYK gamut compression affects specific colors dramatically. Vivid oranges, bright greens, and certain purples are outside standard CMYK gamut and will print significantly duller than their screen appearance. Always check packaging colors in CMYK-mode in your design software before finalizing. If your brand color is outside CMYK gamut, a Pantone spot color is the only way to reproduce it accurately in print — and the additional cost per print run should be factored into the brand decision.
Category color conventions are strong priors that work in your favor or against you. Premium spirits are dark-background, gold-accent. Organic food is muted green and cream. Luxury cosmetics is black or white with metallic. Departing from category convention requires explicit rationale and risks shelf confusion — buyers categorize products partially by color cue before they read text. Brands that successfully break category color convention (e.g., Method's move away from green for cleaning products) usually replace the category signal with a distinctive form factor or other strong visual identity signal.
