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RGB vs CMYK: Screen Colors vs Print Colors

July 23, 2025 โ€ข 4 min read

You design a vibrant logo on your screen, send it to print, and it comes back looking dull. This is the RGB-to-CMYK problem โ€” screens and printers use fundamentally different colour systems. Here is why, and how to handle it.

The Two Color Models

RGB = Red, Green, Blue (additive โ€” light)

CMYK = Cyan, Magenta, Yellow, Key/Black (subtractive โ€” ink)

How RGB Works (Screens)

Screens emit light. They start with darkness (black) and add coloured light to create colours:

  • โ–ถ Red + Green = Yellow
  • โ–ถ Red + Blue = Magenta
  • โ–ถ Green + Blue = Cyan
  • โ–ถ Red + Green + Blue = White
  • โ–ถ No light = Black

This is why it is called "additive" โ€” you add light to get brighter colours. RGB can produce very vivid, saturated colours because it is using light directly.

How CMYK Works (Print)

Printers start with white paper and subtract light using ink:

  • โ–ถ Cyan ink absorbs red light
  • โ–ถ Magenta ink absorbs green light
  • โ–ถ Yellow ink absorbs blue light
  • โ–ถ All inks together = muddy brown (not perfect black, hence the "K" for Key/Black ink)

This is "subtractive" โ€” ink subtracts wavelengths from the white paper's reflected light.

When to Use Each

  • โ–ถ RGB: Websites, apps, social media, video, digital presentations, email graphics
  • โ–ถ CMYK: Business cards, brochures, magazines, packaging, posters, anything physically printed
  • โ–ถ Rule of thumb: If it will be viewed on a screen, use RGB. If it will be printed, convert to CMYK

Why Colors Look Different in Print

  • โ–ถ RGB can display about 16.7 million colours; CMYK can reproduce far fewer
  • โ–ถ Vivid blues, bright greens, and neon colours often cannot be matched in CMYK
  • โ–ถ Screens are backlit (bright); paper relies on reflected light (duller)
  • โ–ถ Different paper types absorb ink differently, affecting the final appearance

Tips for Designers

  • โ–ถ Design for print in CMYK from the start โ€” converting at the end causes colour shifts
  • โ–ถ Use Pantone/spot colours for brand-critical colours in print
  • โ–ถ Soft-proof on screen โ€” most design software can simulate CMYK output
  • โ–ถ Request a physical proof before large print runs
  • โ–ถ Keep your RGB versions for digital use โ€” never convert print files back to RGB

Try It Now

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