CMYK vs RGB: why your brand colours look different in print

Edara Akpan · Oct 7, 2026 · 3 min read

You approve a vibrant blue on screen, then the printed boxes arrive and the blue looks darker and duller. Nothing went wrong at the printer. Screens and ink make colour in opposite ways, and some colours cannot be reproduced in both.

Two ways of making colour

RGB (red, green, blue) is how screens work. A screen starts dark and adds light. Mixing red, green and blue light in different amounts produces every colour you see, and mixing all three at full strength gives white.

CMYK (cyan, magenta, yellow, black) is how most printing works. Paper starts white, and ink absorbs light. Mixing the four inks removes more and more light from the paper, and the black ink adds depth and detail.

The gamut gap

A gamut is the range of colours a system can produce. A screen can usually show some very saturated colours, such as vivid blues, greens and electric neon shades, that standard CMYK inks cannot match. When those colours are converted to CMYK, they shift toward something duller. How big the shift is depends on the colour, the inks and the paper, so the only reliable answer is to test.

Paper and finish change the colour too

The same ink looks different on different surfaces:

• Coated and glossy paper keeps colours bright, because the ink sits on the surface
• Uncoated paper absorbs ink, which makes colours softer
• Cream or kraft stock tints every colour you print on it
• Matte or gloss lamination changes how the colour reflects light

Spot colours and Pantone

Instead of mixing four inks, a printer can use a single pre-mixed ink matched to a reference system such as Pantone. Spot colours give more consistent results across printers and suit logos and packaging with tight brand colours. They can cost more, because they need a separate ink and plate, and they can limit how many colours a design uses. Ask your printer what is practical for your job.

A quick comparison

How to avoid print surprises

1. Choose your palette with print in mind. Check the CMYK version of each colour as you pick it, not at the end
2. Record every value. Keep HEX and RGB for screens, CMYK for print, and Pantone if you use it, all in your brand guidelines
3. Convert early and look at the result. It is better to learn that a colour shifts while you are still designing
4. Ask for a printed proof, on the actual stock, before a large run
5. Do not judge colour on a phone. Screens vary widely in brightness and tone
6. Supply the right files. Printers need vector logos in the correct colour mode (see which logo files to ask for)

When a colour has to match exactly

If one brand colour is critical, use a spot colour for it and accept that other colours in the design will print in CMYK. Even then, expect a small difference between print runs. Agree acceptable variation with your printer before the job starts.

Related reading

When you plan the palette itself, how to choose a brand colour palette from scratch covers the steps. If you are preparing for a print job, the packaging brief guide lists what the printer will need.