RGB to CMYK Converter

How to convert RGB to CMYK?

RGB to CMYK conversion is essential when preparing digital designs for print. RGB is used for screens while CMYK is used for printing. The conversion process calculates the cyan, magenta, yellow, and black (key) components needed to reproduce the RGB color in print.

RGB to CMYK Conversion Formula

K = 1 - max(R/255, G/255, B/255)

C = (1 - R/255 - K) / (1 - K)

M = (1 - G/255 - K) / (1 - K)

Y = (1 - B/255 - K) / (1 - K)

Why convert RGB to CMYK?

RGB to CMYK conversion is necessary when preparing digital artwork for professional printing. Screens use RGB (light-based additive color), while printers use CMYK (ink-based subtractive color). Converting ensures your design colors will print as expected, though some vibrant RGB colors may not have exact CMYK equivalents.

Will colors look different after RGB to CMYK conversion?

Yes, some colors may appear different. RGB has a wider color gamut than CMYK, meaning certain bright colors visible on screen cannot be exactly reproduced in print. Colors like bright blues, greens, and oranges often become less vibrant. Professional designers use color profiles and soft-proofing to preview how colors will look when printed.

When should I use CMYK instead of RGB?

Use CMYK when designing materials for professional printing such as brochures, business cards, posters, and magazines. Use RGB for digital content like websites, apps, social media graphics, and anything viewed on screens. If you're unsure, ask your printer - they typically require CMYK files for the best results.

What is the K in CMYK?

K stands for 'Key' and represents black ink. While combining cyan, magenta, and yellow theoretically creates black, using separate black ink (K) provides deeper blacks, saves on colored inks, and improves print quality. It's called 'Key' because black is the key plate that other colors are aligned to in the printing process.

Common RGB to CMYK Conversions