CMYK Converter
Convert CMYK colors
Results
Frequently Asked Questions
How do I convert RGB to CMYK?
RGB is converted to CMYK by first finding the key (black): K = 1 - max(R,G,B)/255. Then C = (1-R/255-K)/(1-K), M = (1-G/255-K)/(1-K), Y = (1-B/255-K)/(1-K). The calculator handles this conversion instantly.
Why do screen colors look different when printed?
Screens use RGB (additive light mixing) while printers use CMYK (subtractive ink mixing). CMYK has a smaller color gamut — some bright RGB colors cannot be reproduced in print. Always convert to CMYK and proof before printing.
What is the difference between RGB and CMYK color models?
RGB combines red, green, and blue light (0-255 each) for screens. CMYK uses cyan, magenta, yellow, and key/black ink (0-100% each) for print. RGB is additive (white = all colors), CMYK is subtractive (black = all colors).
When should I use CMYK values?
Use CMYK for any print project: business cards, brochures, posters, packaging, and magazines. Professional printers require CMYK files. Use RGB for digital-only content: websites, social media, email, and screen presentations.
What is rich black in CMYK?
Pure black (0,0,0,100) can look washed out in large print areas. Rich black adds other inks for deeper black. Common recipe: C=60, M=40, Y=40, K=100. Avoid using rich black for small text as it can cause registration issues.