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Going from RGB to CMYK is the step every design takes on its way from screen to print, and it’s why a zingy lime green on your monitor can land a touch flatter on the banner. A monitor builds colour by mixing glowing light (RGB). A printer lays cyan, magenta, yellow and black inks onto the surface (CMYK). Ink simply can’t reach some of the most intense colours light can make, so they’re moved to the closest printable match. Supply CMYK files when your software allows, add Pantone numbers for any brand colour, and treat screen and print as near neighbours, not exact copies.
Light versus ink, in plain terms #
Think of a screen as a dark room with three coloured torches. Turn all three up and you get white. Because that light shines straight into your eyes, colours can look electric.
Paper and PVC work the other way round. They start white, and every layer of ink soaks up some of the light bouncing off them. Mix cyan, magenta and yellow and you get a muddy dark brown, not a clean black, which is why printers add a fourth ink, black, known as K. It gives shadows depth and keeps small text sharp.
Each system has a range of colours it can produce, called its gamut. A typical screen’s range stretches further into vivid, saturated shades, so some of them have no exact ink equivalent. Design programs handle the swap using colour profiles, a standard maintained by the International Color Consortium, which explains the idea at color.org.
The four colours that change most in RGB to CMYK #
Not every colour suffers. The ones that shift are the loudest, most saturated shades, the kind that look almost lit from behind on a phone. Here’s what to expect from each family:
| On your screen | On the print, roughly |
|---|---|
| 1. Neon or acid green | Usually the biggest drop. Loses its glow and reads a little flatter |
| 2. Electric blue, bright sky blue | Goes a shade deeper or duller |
| 3. Vivid orange | Loses some punch and can drift towards brown or red |
| 4. Bright purple and violet | May come out slightly greyer |
The good news is that most everyday colours behave. Navy, deep red, greys and skin tones usually land very near what you saw.
If a design hangs on one loud colour, say a lime-green van livery repeated on a banner, do the RGB to CMYK switch yourself before sending. You’ll see the shift on screen and can tweak it, instead of meeting it for the first time when the parcel arrives.
Choosing CMYK in your software #
- Adobe Illustrator and InDesign: pick CMYK as the document colour mode when you create the file, and build your swatches in CMYK.
- Affinity Designer and Publisher: select a CMYK colour format in document setup.
- Canva: certain plans show a CMYK choice when you download a print PDF. No option on yours? Send RGB and we’ll convert it.
- Word and PowerPoint: these only work in RGB. Save a PDF as normal and the conversion happens at our end.
Our online designer also produces RGB print files, and they’re converted in exactly the same way, so keep the table above in mind when picking colours there. Other export settings are in our guide to a PDF for printing.
Brand colours: send the Pantone number #
Got an exact brand shade? Put its Pantone reference on the order or in the file, and we’ll get as near to it as the material permits. Everything in full-colour print is mixed from those four inks, so your Pantone is built out of CMYK; there’s no extra tin of special ink for it. Lots of shades land very close. A few of the brightest and fluorescent Pantones are beyond the reach of four inks, and for those you get the nearest version the process can make.
Just hex codes or RGB numbers from your website? Include them. They help, although for print a Pantone or CMYK reference is the steadier guide.
Black isn’t always just black #
For text, fine lines and small type, stick with straight black, usually written as K100 (black at full strength and nothing else). One ink means crisp edges. Across a big solid area, like a black banner background, that can look slightly washed out. Slip a mix of the other three inks underneath and you get a deeper “rich black”; a common recipe is C60 M40 Y40 K100. Keep rich black for large areas only. On small text, four inks stacked up can make the letters look fuzzy.
The material has its say too #
The same CMYK file looks different depending on what it’s printed on, and no screen can show you that part:
- PVC. Our 440gsm PVC banners give strong, solid colour.
- Mesh. The 260gsm mesh banners are an open weave that lets wind through, and whatever’s behind shows through the holes, so colours look softer close up and read well from further back. Our PVC or mesh guide compares the two.
- Gloss and silk paper. The 130gsm and 170gsm options on flyers keep ink on the surface, so colours look brighter.
- Uncoated paper. Letterheads use smooth white uncoated stock so you can write on them easily. It drinks in more ink, so colours look a bit softer and quieter.
Ordering matching items in different materials? Expect them to be close cousins rather than twins. There’s more on paper in our guide to which gsm paper to choose.
Screen versus print: what’s normal #
Every screen shows colour slightly differently depending on brightness, settings and age. A phone outdoors and a laptop in a dim room can make the same file look like two different designs. That’s why our returns page treats small colour differences between screen and print as normal rather than a fault. Our side of the deal is to reproduce the file you sent, or the design you made, accurately. Understand the RGB to CMYK step, supply CMYK and Pantone numbers where colour matters, and the finished piece should look the way you pictured. Every other file requirement lives on the artwork guidelines page.