Graphic design

RGB vs CMYK: What’s the Difference and When Should You Use Each Colour Mode?

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Anyone working with graphic design, photography or print will regularly encounter the terms RGB and CMYK. Programs like Adobe Photoshop require you to choose one of these colour modes when creating a new document. But what do they mean, and why is choosing the right one so important?

In this article, we clearly explain how RGB and CMYK work and when to use each mode for the best results.

What Do RGB and CMYK Stand For?

  • RGB = Red, Green, Blue
     Used for digital screens such as computers, smartphones and TVs.

  • CMYK = Cyan, Magenta, Yellow and Key (Black)
     Used in traditional and modern printing processes.

The general rule is simple:

  • RGB → for digital content

  • CMYK → for printed materials

Here’s why.

Digital vs Print: Why RGB Is Not the Same as CMYK

Traditional printing methods use layers of CMYK ink to build up colour on paper. Although technology has evolved, printers still largely rely on CMYK ink to reproduce colours.

Screens, however, create colours using light, not ink. They combine red, green and blue light to form millions of possible colours.

RGB has a larger colour gamut

Digital displays can show far more colours than CMYK printing can reproduce. That’s why images on your monitor often look brighter and more vibrant than on paper.

CMYK has limitations

Because CMYK uses physical ink, some bright RGB colours simply cannot be printed accurately. This often leads to visible differences between digital designs and printed results.

How RGB and CMYK Colours Are Created

RGB → Additive Colour Model

RGB adds light:

  • Red + Green + Blue = white

  • Less light = darker colours

Perfect for self-illuminating screens.

CMYK → Subtractive Colour Model

CMYK absorbs light:

  • More ink = less reflected light

  • Colours appear darker and richer

Ideal for physical print.

Conclusion: When Should You Use RGB or CMYK?

✔ Use RGB for digital designs

Such as:

  • Websites

  • Social media graphics

  • Digital ads

  • Presentations

  • Apps

✔ Use CMYK for print

Such as:

  • Flyers

  • Posters

  • Business cards

  • Brochures

  • Stickers

  • Magazines

Choosing the correct colour mode from the start ensures accurate colours and a professional result.