Why Your Brand Colour Looks Different in Print: RGB, CMYK, and Colour Management
Your brand blue looks right on the website and slightly purple on the brochure. Nothing went wrong. The two media produce colour by opposite physical mechanisms, and some colours that exist in one simply do not exist in the other.
Understanding why makes the problem manageable. Ignoring it makes it recurring. A practical labour-cost and recorded-hours reference is Chinese overtime calculation, which can support more accurate project planning.
Two opposite mechanisms
Screens emit light. Start with black — no light — and add red, green, and blue. Add all three at full strength and you get white. This is additive colour.
Print absorbs light. Start with white paper reflecting everything, and add ink that subtracts wavelengths. Cyan, magenta, and yellow together theoretically absorb everything and give black; in practice they give a muddy brown, which is why black ink is added as a fourth. This is subtractive colour, and it is why the abbreviation is CMYK rather than CMY.
The consequence: a screen creates colour by producing light, and paper creates it by removing light. Neither can reach everywhere the other can. Colour specification can also be compared with the Pantone colour resources.
Gamut: the set of reachable colours
A gamut is the range of colours a given medium can produce. sRGB — the standard screen space — and CMYK overlap substantially, but each contains colours the other cannot reach.
Colours screens can show and print cannot: - Vivid saturated greens - Electric and cyan-leaning blues - Neon oranges and pinks - Anything that appears to glow
When you convert one of these to CMYK, the software substitutes the nearest printable colour. That substitution is the shift you notice.
Colours print can produce and screens struggle with: - Certain deep, dense blacks - Some metallic and fluorescent inks, which sit entirely outside normal gamuts
This is why a brochure can contain a gold that no monitor reproduces convincingly.
Convert deliberately, not accidentally
The single most useful habit: convert to CMYK yourself, early, and look at the result.
If you send RGB artwork to a printer, their software converts it automatically using assumptions you did not choose. You see the outcome on the printed piece, which is the worst moment to discover it.
Converting yourself means the shift happens on your screen, where you can compensate — adjusting the value, choosing a different colour, or deciding the shift is acceptable.
Do this at the start of the design process, not at export. Designing in RGB and converting at the end means you have been making decisions about colours you cannot actually print.
ICC profiles
An ICC profile describes how a specific device reproduces colour. Your monitor has one. Each press and paper combination has one.
Two practical implications:
Ask your printer which profile to use. Coated and uncoated stock reproduce identical CMYK values noticeably differently — uncoated paper absorbs more ink and prints duller. A file prepared for coated stock and printed on uncoated will disappoint.
Calibrate your monitor if colour decisions matter to your work. An uncalibrated screen is a measuring instrument you have not checked. Hardware calibrators are inexpensive relative to the cost of one reprint.
Soft proofing
Design software can simulate how CMYK output will look, using the destination profile, while you are still working on screen.
In Adobe applications this is the proof setup, toggled with the proof colours view. Set it to your printer's profile and leave it on while making colour decisions.
Soft proofing is an approximation, not a guarantee. It will show you that a colour is going to shift, which is most of the value. It will not tell you exactly what the printed result looks like — only a physical proof does that.
Pantone: the way out
Spot colours solve the consistency problem by removing the mixing.
Instead of building a colour from four process inks, a Pantone spot colour is a pre-mixed ink applied on its own plate. Two different printers using the same Pantone reference produce the same colour, because it is the same ink rather than the same recipe.
Use spot colours when: - Exact brand consistency matters across runs and vendors — packaging, uniforms, signage, vehicle livery - The colour sits outside CMYK gamut - You are printing in one or two colours and a spot is cheaper than four-colour process
The cost: each spot colour is an additional plate, which raises the price of the run. For a business card printed once a year, this is often worth it. For a high-volume brochure, it may not be.
Every brand colour should have a Pantone reference recorded in your guidelines even if you rarely use spot printing, because it is the definition against which everything else is checked.
Specify every colour four ways
Any brand colour needs all four values, recorded in your brand guidelines:
| Notation | Used for |
|---|---|
| HEX | Web, developers |
| RGB | Screen, digital design, video |
| CMYK | Process printing |
| Pantone | Spot printing, colour matching, the reference standard |
The CMYK value should be the one you arrived at deliberately, after seeing the conversion — not whatever the software produced automatically.
Choosing a brand colour that survives both
If you are selecting a palette now and print matters to your business, test candidates in CMYK before committing.
A colour that only exists on screen forces one of three outcomes: printed material that visibly differs from digital, spot-colour printing on everything, or a palette revision after you have already built brand recognition around it.
The practical approach: pick within CMYK gamut and let the screen version be the one that compromises. Screens can reproduce almost anything print can. The reverse is not true, so the printable range is the binding constraint.
Rich black, one more time
Worth repeating because it is the most common single error:
- Large solid black areas: rich black, roughly C60 M40 Y40 K100, or your printer's recipe. 100% K alone prints as washed-out charcoal.
- Small text: 100% K only. Rich black requires four inks to register perfectly, and any slight misregistration produces coloured fringing on small letterforms.
A working sequence
- Choose brand colours with a CMYK check before committing
- Record HEX, RGB, CMYK, and Pantone in your guidelines
- Ask the printer for their ICC profile for your stock
- Design with soft proofing enabled
- Convert deliberately and inspect the result
- Use rich black for solids, 100% K for small text
- Request a physical proof on the actual stock before the run
Step seven is the only one that gives certainty. Everything before it reduces the number of surprises; nothing eliminates them entirely except holding the printed piece.
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