CMYK vs RGB for Printing: Why Colours Change
Understand the difference between colour on a screen and colour produced with printing inks or toner.
Quick answer
RGB is designed for screens and creates colour using red, green and blue light. CMYK is used for most commercial printing and creates colour using cyan, magenta, yellow and black ink or toner. Some bright RGB colours cannot be reproduced exactly in CMYK, so neon blues, vivid greens and highly saturated colours may appear less bright after printing.
Key points
- RGB is mainly used for screens and digital displays.
- CMYK is used for most commercial colour printing.
- RGB can display brighter colours than standard CMYK printing.
- A screen produces light, while printed paper reflects light.
- Monitor brightness affects how artwork appears.
- Paper type and lamination can change colour appearance.
- Critical brand colours may require printed proofs or spot colours.
What is RGB colour?
RGB stands for red, green and blue. These colours are combined as light inside monitors, smartphones, tablets, televisions and other digital displays.
When red, green and blue light are combined at full strength, they create white light. This is known as an additive colour model because more light is added to produce brighter colours.
What is CMYK colour?
CMYK stands for cyan, magenta, yellow and key, with key referring to black. These inks or toners are combined during printing to produce a wide range of colours.
CMYK is a subtractive colour model. Printed pigments absorb parts of the incoming light and reflect the remaining colour back to the viewer.
RGB and CMYK compared
RGB
For screensRGB creates colour using emitted light. It can display very bright and saturated colours, especially luminous blues, greens and reds.
- Websites
- Social-media graphics
- Mobile applications
- Video and digital advertising
- Computer and television displays
CMYK
For printingCMYK creates colour using printed pigments. Its colour range is generally smaller than the colour range shown by modern screens.
- Business cards
- Flyers and brochures
- Booklets and catalogues
- Posters and marketing materials
- Labels and packaging
Why screen colours can look different when printed
Screens emit light
A monitor produces its own light, making colours appear bright, vibrant and luminous.
Paper reflects light
Printed colour depends on light reflecting from ink or toner and the surface of the paper.
Colour ranges differ
Some RGB colours sit outside the printable CMYK colour range and must be converted to a nearby printable tone.
CMYK vs RGB comparison table
| Feature | RGB | CMYK |
|---|---|---|
| Main purpose | Digital screens | Commercial printing |
| Colour components | Red, green and blue | Cyan, magenta, yellow and black |
| Colour method | Emitted light | Printed pigment |
| Colour range | Generally wider and brighter | More limited than RGB screens |
| Typical file use | Web, video and social media | PDFs and professional print artwork |
| White colour | Created by combining light | Usually the colour of the paper |
| Black colour | Absence of screen light | Produced mainly with black ink or toner |
Which colours are most likely to change?
Highly saturated or luminous screen colours are more likely to look different after conversion to CMYK.
Bright blue
Electric or neon blue may become darker, duller or more purple when converted for printing.
Vivid green
Fluorescent-looking green can lose brightness because standard CMYK cannot reproduce the same emitted-light effect.
Strong orange and red
Some intense reds and oranges may shift depending on the printer, profile and paper.
Very dark colours
Dark backgrounds may lose shadow detail or print more heavily than expected.
How paper affects printed colour
The same artwork can look different when printed on different materials. Paper whiteness, coating, texture and absorbency all influence the final colour.
Coated paper
Coated stocks usually hold ink or toner closer to the surface, often creating sharper images and stronger colours.
Uncoated paper
Uncoated paper absorbs more ink and may produce softer, less-saturated colours.
Coloured or kraft paper
The colour of the material influences every printed colour, especially when white ink is not used underneath.
How lamination affects colour
Gloss lamination can increase contrast and make colours appear richer or more vibrant. Matte lamination creates a softer, lower-glare appearance and may make colours look more subdued.
The finish should therefore be considered when evaluating colour, especially for photographs, menus, business cards and premium marketing materials.
Should artwork always be converted to CMYK?
CMYK is generally preferred for conventional commercial printing because it provides a more realistic indication of the printable colour range.
However, modern printing workflows may handle colour conversion internally using specific printer profiles. For that reason, customers should follow the artwork requirements provided for the selected product.
What is a colour profile?
A colour profile describes how a device or printing condition interprets colour. Profiles help software translate colour between monitors, cameras, scanners and printing systems.
Using an unsuitable or missing profile can produce unexpected colour shifts. Customers with strict brand-colour requirements should discuss colour management before production.
What about Pantone and spot colours?
Pantone and other spot-colour systems specify individual ink colours rather than building every colour from standard CMYK. They are often used where consistent corporate colours are important.
Spot-colour printing may involve additional cost, production requirements and minimum quantities. It is not automatically available for every digital-printing product.
Can a monitor show the exact printed result?
A monitor can provide an approximation, but it cannot perfectly reproduce the behaviour of ink, toner, paper and lamination.
Monitor brightness also creates unrealistic expectations. Artwork viewed on a very bright display may appear darker after printing.
Colour preparation checklist
- Prepare print artwork using the required colour mode.
- Avoid relying on highly luminous RGB colours.
- Check colour after converting the artwork to CMYK.
- Use high-resolution images.
- Embed or preserve the correct colour profile.
- Consider the paper colour and coating.
- Consider matte or gloss lamination.
- Request a proof when colour is critical.
- Provide an official brand-colour reference where available.
- Do not use the screen as the only colour reference.
Frequently asked questions
Why did my printed blue become purple?
Some bright RGB blues cannot be reproduced directly in CMYK. During conversion, the colour may move toward a darker or more purple printable value.
Can Image Magic print directly from an RGB file?
Some production workflows can process RGB artwork, but the colours still need to be converted to the printer's output colour space. Colour changes may occur.
Will CMYK colours look exactly the same on every printer?
No. Different printers, inks, toners, profiles, papers and maintenance conditions can produce slightly different results.
Which black should I use for small text?
Small black text is usually safest as 100% black only. Using multiple CMYK colours for fine text may create registration or sharpness issues.
Why does uncoated paper look duller?
Uncoated paper absorbs more ink and reflects light differently, which can produce softer and less-saturated colour.
Should I request a printed proof?
A proof is recommended when colour is critical, especially for corporate branding, photography, packaging or large production quantities.
Need help checking your artwork colours?
Send us your PDF, product type, paper choice, quantity and colour requirements. Our team can review the basic colour mode and production setup before printing.
Ask Our Prepress Team