Brand & Design
What is CMYK?
A subtractive color model used in print that mixes cyan, magenta, yellow, and black inks to produce colors on paper.
Also known as: Cyan Magenta Yellow Black, four-color process
CMYK stands for Cyan, Magenta, Yellow, and Key (black, called "key" because it is the alignment ink in traditional plate printing). Each ink is specified as a percentage from 0% to 100%. Where RGB adds light to make colors brighter, CMYK adds ink to subtract reflected light: more ink = darker. White is the absence of ink (the paper itself).
A brand styleguide that ships physical assets (business cards, packaging, signage) declares CMYK values alongside hex and RGB so the printer can match the screen color as closely as physically possible. Conversion is lossy because the gamuts do not overlap perfectly: vivid screen blues and greens often dull on press, and some deep browns are harder to hit on screen than on paper.
For Brand.dev-style automated brand intelligence, CMYK matters less day-to-day (the web is RGB) but it is still a field worth capturing if a brand publishes one. The CMYK value is the "what to send the print shop" answer that complements the "what to put in CSS" hex.
In the wild
- →A logo styleguide declaring CMYK 100/72/0/18 alongside hex
#0050a0for the primary blue - →A brand asset kit with two variants of the logo: an RGB SVG for digital and a CMYK PDF for print
- →A printer rejecting a file submitted in RGB and asking for a CMYK conversion to avoid color shifts
How Brand.dev uses cmyk
Endpoints in the Brand.dev API where this concept comes up directly.
FAQ
Why is the K in CMYK black?
It stands for "key" (the key plate that aligns the others in printing), which historically was black. Calling it "B" would have collided with blue from RGB; "K" avoids the ambiguity.
CMYK vs Pantone?
CMYK is a four-ink process used for full-color prints (magazines, packaging). Pantone is a spot-color system: each color is a single pre-mixed ink, more accurate but more expensive. Brands often specify both: Pantone for the official color, CMYK for everyday prints.
Can I convert CMYK to RGB programmatically?
Approximately. Exact conversion depends on the printer's color profile (ICC). For a styleguide reference, a standard SWOP or FOGRA profile is close enough; for production, send the printer a profile and let them handle it.
Related terms
A color model that represents colors as additive combinations of red, green, and blue light, used by every digital screen.
A six-digit (or three-digit) hexadecimal representation of a color's red, green, and blue components, the most common way to write colors in CSS and design tools.
A standardized spot-color system used in print, where each color is a pre-mixed ink with a globally consistent reference number (e.g., Pantone 286 C).
The defined set of colors a brand or design system uses, typically organized into primary, secondary, neutral, and semantic groups.