Your monitor lies, the print shop tells the truth. CMYK or RGB for print, and how do you avoid a nasty surprise?
One of the most common stories clients bring me after a trip to the print shop always sounds the same: “The design looked beautiful on screen, but the print looks completely different.” A deep navy turned gray, a juicy orange came out muddy and a green lost all its glow. It’s almost never the print shop’s fault or your monitor’s. A screen and a printing press create color by entirely different rules, and the question “CMYK or RGB for print?” is really a question about which of those rules applies where.
The short answer: CMYK for print, RGB for screens
If you only need the rule, here it is: anything that will be printed gets prepared in CMYK, and anything that will be viewed on a screen stays in RGB. Many digital print shops will accept an RGB file and convert it themselves, but then an automated process decides how your colors change, and you only find out when you pick up the order. With a box of business cards that might be tolerable. With a packaging run of several thousand pieces it isn’t.
The exception is spot colors, such as Pantone, metallic gold or fluorescent inks. These are printed with a separate, premixed ink outside of CMYK and are used mainly in offset printing or branded merchandise, when a brand color has to be identical on every surface.
Your monitor emits light, paper absorbs it
The easiest way to picture the two modes is as two different sources of color. A monitor works like a flashlight: it produces light itself by mixing three colors, red, green and blue (hence RGB). The more light, the brighter it gets, and all three at full strength make white.
Print works the other way around. Four inks are laid onto white paper: cyan, magenta, yellow and black (CMYK, where K stands for black). Each layer absorbs some of the light reflected from the paper, so the more ink, the darker the result, and the brightest point you can get is simply unprinted paper. A screen shows you color that shines toward you, while a print shows the color that’s left after light from the room bounces off it. That’s why the same values never look identical.
Colors the print shop simply doesn’t have
RGB covers a much wider range of colors than CMYK. A monitor can easily display intense oranges, neon greens, electric blues and purples, but four inks can’t reproduce them. During conversion, software has to find the closest possible match, and that match can be surprisingly far from the original.
This has direct consequences for a brand. If a company color was picked by eye on a laptop screen, it may turn out it doesn’t exist in print at all. That’s why in a well-prepared visual identity every color has separately defined CMYK, RGB and HEX values, checked so they look as similar as possible on paper and on screen, instead of relying on automatic conversion.
How to prepare colors in a print file
The list below is the minimum I check on every project meant for print. You can go through it yourself before sending a file:
- Ask the print shop for its color profile: offset printing on coated paper often uses profiles based on the FOGRA39 standard or the newer FOGRA51, but the final choice always comes from the print shop. Convert colors deliberately with that profile, not with default settings.
- Turn on the out-of-gamut preview: design apps can highlight areas that can’t be printed. It’s better to fix them yourself than to leave them to an automated process.
- Tell two kinds of black apart: large dark areas look better in so-called rich black, made of several inks (a popular recipe is C60 M40 Y40 K100). Small text, on the other hand, should be set in plain K100 black, because with even a slight misregistration, letters built from four inks turn blurry.
- Watch the total ink coverage: too much ink in one spot dries slowly and can transfer to neighboring sheets. Print shops give a limit, most often around 300%.
- Check your photos: at their final size they should be about 300 dpi and also converted to CMYK.
- Export a PDF in the print shop’s standard: usually one of the PDF/X variants, which makes sure colors and fonts reach the press intact.
Paper and screens have a say too
Even a perfectly prepared file will look different on two different papers. On coated stock, colors are vivid and crisp, while on uncoated paper the ink soaks in deeper, so the same design comes out darker and more matte. A good file takes that into account from the start, not after the first complaint.
The second factor is the screen itself. A bright, uncalibrated laptop display shows colors more saturated than they will be on paper. For important runs, such as packaging or catalogs, it’s worth ordering a proof. It costs a fraction of the whole job and can save the entire run.
When RGB is exactly right
CMYK isn’t the “better” mode and RGB the “worse” one. They’re two tools for two different media. Graphics for your website, social media posts and ads, presentations and PDFs meant to be read on screen should be prepared in RGB, because there’s no print shop there, only a display. If you left them in CMYK, the colors on screen would look needlessly dull.
Problems only start when the same file travels both ways without preparation. That’s why with a logo project you always get two sets of files, one for print and one for screens. It’s one of the points worth checking when you read about what a logo price should include.
Tell me what you’re printing
If you’re about to print business cards, flyers, a roll-up banner, labels or packaging and you’re not sure your files are ready, write to me. I’ll check your current files, prepare them for your print shop’s requirements or design the materials from scratch. You’ll find prices for print design on my services page, and either way you get files you can send to print right away, without phone calls asking for corrections.