RGB vs CMYK: Why Colour Matters in Print

RGB is how screens make colour with light, and CMYK is how print makes colour with ink, which is why a bright shade on your monitor can look flatter once it is printed. Screens mix red, green and blue light and can glow; print mixes cyan, magenta, yellow and black ink on paper, which reflects light rather than emitting it. That difference is normal, predictable, and manageable once you understand it.

If your printed colours never quite match the screen, you are not doing anything wrong. This guide explains the difference between RGB and CMYK, why some colours shift more than others (orange is a great example), and how to keep your brand colours consistent across everything you produce.

RGB vs CMYK: what is the difference?

RGB and CMYK are two different ways of creating colour, one for screens and one for print. RGB stands for red, green and blue, the colours of light your screen combines to make every shade you see. CMYK stands for cyan, magenta, yellow and key (black), the inks a printer lays down on paper.

The key distinction is light versus ink. RGB is additive: start with black and add coloured light to build brightness, up to pure white. CMYK is subtractive: start with white paper and add ink, which absorbs light, so more ink means a darker result. Because they build colour in opposite directions, they can reach different colours, and RGB can reach some that CMYK cannot.

Why screen colours do not always print the same

Screen colours do not always print the same because a screen makes colour with light and print makes it with ink, and the two cannot reach an identical range. Your monitor can display vivid, luminous colours by emitting light directly. Ink on paper can only reflect the light in the room, so the same colour reads as slightly softer.

Two more things add to the shift. First, screens vary: two monitors rarely show the exact same colour, and neither may match the print. Second, paper matters. The same ink looks different on a bright coated stock than on a natural uncoated one, because the paper's colour and texture change how light bounces back. None of this is a fault. It is the physics of light and ink, and a good printer manages it deliberately.

Which colours are hardest to reproduce in print? Orange as a worked example

The hardest colours to reproduce in print are vivid, saturated ones, and bright orange is the classic example. On screen, orange glows because it is made from intense red and green light. In CMYK, orange has to be built mostly from magenta and yellow ink, and ink simply cannot glow the way light does, so a punchy screen orange often prints slightly warmer, deeper or more muted than expected.

Oranges are not alone. Vivid greens, bright purples and any neon or fluorescent shade tend to shift the most, because they sit near the edge of what CMYK ink can achieve. If a colour like this is central to your brand, the solution is not to hope: it is to proof it on your chosen stock, and where the budget allows, use a spot colour (a pre-mixed ink, such as a Pantone) so the colour is consistent every time rather than rebuilt from process inks.

It is not just bright colours: pale and very dark colours too

Very pale and very dark colours can shift in print too, not only the vivid ones. Soft pastels and near-white tints can look cleaner on screen than on paper, and small changes in ink can make a subtle tint look patchy or slightly off.

Deep, rich colours have the opposite challenge. A solid black built only from black ink can look weak in print, especially over a large area. Printers use a "rich black", which adds cyan, magenta and yellow beneath the black to give a deeper, more even result. Very dark blues and browns need care too, so they read as intended rather than turning muddy. The takeaway is simple: the extremes at both ends of the range need attention, not just the brights.

Why this matters for brand consistency

Colour consistency matters because your brand colour is one of the fastest ways customers recognise you, and it has to hold across screen, print and different papers. If your brand blue looks one way on your website, another on a brochure and a third on packaging, that inconsistency quietly weakens recognition and looks less considered.

Getting it right means defining your colours in both worlds: RGB (or hex) values for screen, and CMYK or spot colour values for print, ideally tested on the stocks you actually use. A printer with strong colour management and quality control will then reproduce those values reliably run after run, which is exactly what protects a brand and reduces costly reprints.

Top tip: involve your printer early

The single best thing you can do for colour is involve your printer before the artwork is finished, not after. At B&B Press, we don't typically rely on Pantone spot colours. Instead, we combine industry-leading press technology with colour-managed workflows, experienced studio staff and skilled press operators to achieve accurate, consistent colour using CMYK printing. Every job is carefully managed from artwork through to production, ensuring colours are reproduced as closely as possible to your brand while maintaining consistency across the print run.

FAQ

Why does my print look different to my screen?

Because screens create colour with light (RGB) and print creates it with ink (CMYK), and the two reach slightly different ranges. Vivid screen colours often print a little softer. A proof on your chosen paper shows the real result before you commit.

Should I design in RGB or CMYK?

Design for screen in RGB and supply print artwork in CMYK, or set up your file in CMYK from the start if it is print only. Either way, define your brand colours in both so screen and print stay aligned, and confirm critical colours with your printer.

What is rich black?

Rich black is a deeper black made by adding cyan, magenta and yellow ink underneath the black, rather than using black ink alone. It prevents large black areas from looking weak or grey in print.

How do I keep brand colours consistent across print and digital?

Define your colours as hex or RGB for screen and CMYK or spot (Pantone) values for print, test them on your actual stocks, and use a printer with strong colour management. Consistent reference values plus reliable reproduction keep the brand aligned everywhere.

Get your colours right before you print

Not sure how your brand colours will print? Send your artwork to B&B Press for a colour check, or talk to the studio about litho and digital options that keep your colour consistent.