CMYK vs RGB: Which Color Mode Should You Use?
RGB and CMYK build color for two different physical media, light and ink, and mixing them up is the single most common reason a design "changes color" the moment it goes to print.
- RGB is additive (light) — use it for anything on a screen
- CMYK is subtractive (ink) — use it for anything printed
- RGB has a wider gamut than CMYK, so bright screen colors often shift duller once printed; design in the target mode from the start
RGB: Building Color With Light
Screens emit light. RGB is additive: start from black (no light) and add red, green, and blue light to build every color. Max all three and you get white. Because it adds emitted light, RGB can produce very bright, saturated colors — the vivid blues and greens you see on a phone screen.
CMYK: Building Color With Ink
Paper reflects light. CMYK is subtractive: start from white paper and add cyan, magenta, yellow, and black (K) ink, each of which absorbs (subtracts) part of the spectrum. More ink = darker. Because ink can only ever remove light, CMYK can’t reach the brightest colors RGB can — there is simply no "glow."
Why Colors Shift in Print
RGB’s range of reproducible colors (its gamut) is larger than CMYK’s. When you send a bright RGB design to print, any color outside the CMYK gamut gets clipped to the nearest printable color — usually duller. Neon greens, electric blues, and pure bright oranges are the usual casualties.
Which to Use
- Web, app, social, video — RGB (or HEX). Always.
- Business cards, brochures, packaging, posters — CMYK, set up before you design.
- Brand colors — Define both: a HEX/RGB for screen and a CMYK (or Pantone) for print, and check they look close.
If you must convert RGB → CMYK, do it early and review the result, rather than letting the printer convert automatically at the end.
Frequently asked questions
Should I use RGB or CMYK?
Use RGB for anything viewed on a screen (web, app, social, video) and CMYK for anything printed (cards, brochures, packaging). Match the mode to the medium to avoid color shifts.
Why do my colors look different when printed?
Because RGB has a wider gamut than CMYK. Bright, saturated screen colors fall outside what ink can reproduce, so they get clipped to a duller printable equivalent.
What does the K in CMYK stand for?
K stands for "key", the black plate. Black gets its own ink (rather than mixing C+M+Y) for sharper text and deeper, more reliable dark tones.
Is Pantone the same as CMYK?
No. Pantone is a library of pre-mixed spot inks identified by number, while CMYK builds color by overprinting four process inks. A Pantone spot color is often more consistent than its closest CMYK approximation.
Convert between color modes
See HEX, RGB and CMYK values for any color side by side