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GamutDesk

RGB to CMYK Print Prep Converter

Calculate print ink separations (Cyan, Magenta, Yellow, Black) from digital RGB screen values with K-black extraction.

100% Client-SideZero Data Collection
RGB Input Channels (0 - 255)
Red
Green
Blue
#2563EB
CMYK String
cmyk(84%, 58%, 0%, 8%)
Cyan (C)84%
Magenta (M)58%
Yellow (Y)0%
Black Key (K)8%
Total Area Coverage (TAC):150%

Technical Specification & Mathematical Principles

Channels are normalized as R' = R/255, G' = G/255, and B' = B/255.

Black key component is K = 1 - max(R', G', B'). Remaining chromatic ink fractions calculate as C = (1 - R' - K) / (1 - K), M = (1 - G' - K) / (1 - K), and Y = (1 - B' - K) / (1 - K).

Frequently Asked Questions

The black channel is calculated as K = 1 - max(R', G', B'), which extracts the common darkest shared proportion across all three additive light channels.

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