RGB vs CMYK for Printing
Screens create colour with light using RGB (red, green, blue). Most printers create colour with ink using CMYK (cyan, magenta, yellow, black). This difference is why a vivid screen colour can look duller on paper.
The short version
- Design for screen (websites, social media, video): keep RGB.
- Design for digital print (inkjet, laser, most print shops): RGB is usually fine because the shop converts the file automatically with their colour profiles.
- Design for commercial offset printing (magazines, packaging, large runs): follow the printer's instructions, which often mean supplying CMYK files.
Why colours change
RGB is an additive colour space: combining red, green and blue light makes white, and the gamut (range of colours) is larger than ink can reproduce. CMYK is subtractive: ink absorbs light, and bright neon colours from a screen simply do not exist as ink on paper. A conversion can never add colour the printer cannot produce - it only maps to the closest printable colour.
Practical tips
- Ask your print service which colour mode and profile they want before exporting.
- Proof on the same paper type if colour accuracy matters, because paper brightness changes appearance.
- Avoid designing with neon or very saturated screen colours if exact reproduction is important.
- Use soft-proofing in Photoshop (View → Proof Setup) to preview the CMYK result before sending files.
Frequently asked questions
Do I need to convert my JPEG to CMYK before sending it to a print shop?
Usually not for digital printing. Most shops accept RGB and convert automatically. Only follow a specific CMYK request from an offset printer or a service that demands CMYK files.
Why is my printed blue or green different from my screen?
Every screen shows colour slightly differently, and CMYK ink cannot reproduce the brightest RGB blues and greens. Calibrate your monitor and ask for a physical proof when colour is critical.
Spot colours and brand consistency
Some brand colours - especially oranges, deep blues and metallics - cannot be reproduced accurately with process CMYK. In offset printing a spot ink (often specified as a Pantone colour) is printed from its own plate, which gives a consistent, vivid result at the cost of an extra plate and setup fee. Digital printers usually simulate spot colours with CMYK, so ask for a proof if the exact shade matters.
Screens, calibration and proofs
No two screens show colour identically. An uncalibrated monitor may be too bright or too saturated, which makes the printed result look flat by comparison. For critical work: calibrate the display, use soft-proofing with the printer's ICC profile, and order a hard proof on the final paper stock. The proof is the only reliable reference for how ink behaves on that material.
Exporting for print
- Finish all edits in RGB, where the tools and filters are designed to work.
- Convert once, at the end, using the profile your printer recommends - repeated conversions lose colour data.
- Embed the profile when exporting PDF or TIFF so the printer knows what the numbers mean.
- Check that black text uses a single black channel where the printer asks for it.
Related tools and guides
Print file setup checklist · Best file format for printing · Print PPI calculator