Print's four-ink model, converted to a screen-ready hex color
70% cyan, 15% magenta, 0% yellow, and 0% key/black (C=70, M=15, Y=0, K=0) converts to hex #4dd9ff, equivalently rgb(77, 217, 255) -- a bright sky blue, dominated by the cyan ink with a touch of magenta pulling it slightly toward blue rather than pure cyan.
CMYK is a subtractive color model (inks absorb light, so more ink means less reflected light, which is why higher CMYK percentages generally produce darker results), while RGB is additive (more light in each channel means a brighter result) -- this fundamental difference is why CMYK and RGB values for a 'similar-looking' color don't share an obvious, direct numeric relationship the way hex and RGB do.
With K (black/key) at 0% in this example, no ink is 'darkening' the mix, which is why the result comes out as a bright, light color despite 70% cyan being a fairly saturated cyan value on its own.
Why this is a simplified conversion, not a print-accurate one
Simple (1-C)*(1-K) device math. ICC profiles and paper stock are not applied. This uses a straightforward device-independent formula (each RGB channel calculated from (1-C)x(1-K) style math) -- real print production uses ICC color profiles that account for the specific printer, ink set, and paper stock being used, all of which affect how CMYK ink actually translates to visible color in a way this generic formula doesn't capture.
The same CMYK values printed on different paper stocks (glossy versus matte, white versus slightly off-white) can produce noticeably different final colors in reality -- something no generic device-independent CMYK-to-RGB formula, including this one, can predict without knowing the specific print conditions.
This conversion is useful for a rough on-screen preview of what a CMYK color might look like, or for going from a print spec to a starting-point screen color -- but for color-critical print production work, always confirm the actual printed result with a physical proof rather than trusting a generic on-screen conversion.
Related color-conversion and print-warning tools
For checking whether a design's colors might shift unexpectedly when moved between screen and print contexts, the Print CMYK vs. RGB Warning Checker flags that specific risk.
For converting the resulting hex color into other formats like HSL, the HSL/HSLA to HEX Converter covers that related conversion.
Frequently Asked Questions (FAQ)
Why does 70% cyan and 15% magenta produce a light, bright blue rather than a darker color?
Simple (1-C)*(1-K) device math. ICC profiles and paper stock are not applied. Because K (black/key) is at 0% -- with no black ink darkening the mix, and yellow also at 0%, the result leans toward a bright cyan-blue rather than a muted or dark tone. K is the ink channel that most directly controls how dark the overall result becomes.
Why don't CMYK and RGB values for a similar color share an obvious numeric relationship?
CMYK is a subtractive model (ink absorbs light, more ink means darker), while RGB is additive (more light in each channel means brighter) -- these fundamentally different underlying mechanisms are why there's no simple, direct proportional relationship between the two systems' values.
Will the printed color match exactly what this converter shows on screen?
Simple (1-C)*(1-K) device math. ICC profiles and paper stock are not applied. Not necessarily. This uses a generic, device-independent formula. Real print production depends on ICC color profiles specific to the printer, ink set, and paper stock, all of which affect the actual printed color in ways this simplified conversion doesn't account for.
Does paper stock (glossy vs. matte) affect the actual printed result?
Simple (1-C)*(1-K) device math. ICC profiles and paper stock are not applied. Yes, significantly in real print production -- the same CMYK values can look noticeably different on different paper stocks, a factor no generic CMYK-to-RGB conversion formula, including this one, can predict.
What is this converter best used for?
A rough on-screen preview of a CMYK color, or a reasonable starting point when translating a print color spec into a screen color. For color-critical print production, always confirm the actual result with a physical proof rather than relying on this generic conversion alone.
