Why screen and print colors differ
The most fundamental fact about print color that screen-native designers frequently underestimate is that CMYK is a smaller color space than RGB. The range of colors that can be reproduced on a commercial offset press — even a well-calibrated, high-quality one — is significantly narrower than the range displayable on a modern computer monitor. This means that a design created in RGB for screen will, when converted to CMYK for print, have some colors shift — sometimes dramatically. Vivid electric blues (especially those near #0066FF or #0033CC), saturated greens, and neon oranges are the most common casualties: colors that look striking on screen and dull or muddy in print. The screen-to-press gap exists because RGB creates color by adding light (additive mixing, with a broader achievable gamut) while CMYK creates color by subtracting light through ink absorption (subtractive mixing, with a narrower achievable gamut).
