Oliver Bennett
Why the print never quite matches the screen
You spend an evening building a set of lino print labels or a wedding invitation suite. On screen the greens are luminous, the oranges sing, the deep navy looks bottomless. You hit print, or you send the file to a printer, and what comes back is flatter, duller and somehow greyer than what you designed. Nothing is broken. You have simply crossed from one colour language into another, and the two do not share a dictionary.
Understanding that gap is the difference between a maker who fights their printer every week and one who gets predictable results first time. It is not about expensive kit. It is about knowing which colour mode you are working in, and why.
Light versus ink: the actual difference
RGB is additive. Your screen makes colour by firing red, green and blue light at your eyes. Start with black, add light, and you build towards white. Because you are mixing light, you can reach very bright, very saturated colours — that fluorescent lime, that electric cyan.
CMYK is subtractive. Ink sits on paper and absorbs light. Cyan, magenta, yellow and black inks are layered on a white sheet, and each layer removes some brightness. Start with white paper and add ink, and you build towards black. Paper is never quite white, ink is never perfectly pure, and every layer muddies things a little.
So the two systems have different ranges of colour — different gamuts. RGB contains colours no inkjet or press can reproduce. When you convert, those out-of-range colours get pulled back to the nearest ink version. That is the dulling you are seeing.
Where your best colours disappear
Some colours survive the crossing; others sulk badly.
- Vivid greens and turquoises — the heart of so many botanical and folk-art palettes — are the classic casualties. They often land noticeably softer and slightly greyer.
- Bright oranges and warm reds usually hold up better, especially on coated stock.
- Neons, metallics and glowing gradients cannot be made with standard process inks at all. They need spot inks, foil or speciality paper — plan for them, do not hope for them.
- Deep, rich blues and purples tend to go muddy and slightly violet when converted, because the magenta and cyan struggle to combine cleanly.
If a colour is critical to your design, pick it from a printed colour reference book rather than from your screen. A physical swatch is the only honest guide.
Setting up a file that behaves
Use RGB while you are editing photographs and working on screen. Convert to CMYK only when the artwork is finished and you know how it will be printed. Converting early means you throw away colour information you cannot get back, and repeated conversions compound the damage.
In most image editors you have two very different commands: one assigns a profile and one converts to it. Assigning tells the software "pretend this file was always in this space" and it shifts your colours wildly. Converting translates them properly. Always convert.
Turn on soft proofing if your software offers it. This shows you an on-screen simulation of how the file will print, ink limitations included. It looks disappointing at first. That is the point.
Watch your total ink coverage, usually called TAC. Anything above roughly 300% on coated stock, or 240–260% on uncoated, can smudge, offset or simply refuse to dry. Most suppliers will state their limit.
Finally, keep black text as pure black only — 100% K, no cyan, magenta or yellow. Rich black, made from all four inks, is beautiful for large solid areas but produces fuzzy edges on small type and registration shadows if the press drifts.
Home printers, paper and the last ten per cent
Desktop inkjets and colour lasers almost always expect RGB files and do their own internal conversion. If you force a CMYK file onto a home machine without a proper profile, you usually make things worse. Check your printer settings, choose the correct paper type, and let the driver handle the conversion.
Paper changes everything. Uncoated and recycled stocks drink ink, so colours look softer and darker, and fine detail loses crispness. Coated papers hold ink on the surface and give brighter, sharper results. If you are printing a run for sale, test on the exact stock you intend to use — not on the cheap paper in the tray.
For home printing, keep test strips of your favourite colour blends. A row of small swatches printed on your usual paper, labelled with the settings used, saves hours of guessing later.
A quick pre-flight check before you send anything
- Is the final artwork in CMYK, with images converted rather than assigned?
- Are black text and thin lines set to 100% K only?
- Is total ink coverage within your printer's stated limit?
- Are photographs at 300dpi at the size they will actually print?
- Have you soft-proofed, and accepted the shifts you can see?
- Have you exported a flattened PDF, fonts embedded, no stray layers or hidden guides?
Do these six things and your files will arrive calm, predictable and printable. The colours will still change a little between screen and paper — they always do — but they will change in ways you chose, not ways that caught you out.
