Rgb Cmyk Converter
Fast, accurate and free online rgb cmyk converter tool running directly in your browser.
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Other tools you may find usefulRGB to CMYK converter – screen colors to print colors
RGB (Red, Green, Blue) is a color model for screens – additive (light). CMYK (Cyan, Magenta, Yellow, Key/Black) is a model for printing - subtractive (ink). When designing for print, you must convert RGB to CMYK because colors may vary. The tool calculates both routes with a preview.
RGB vs CMYK – differences
RGB: additive color model. Red + green + blue light = white. Used: screens, TV, phones. Range: 0-255 per channel = 16.7 million colors. CMYK: subtractive. Cyan + Magenta + Yellow + Black paint = absorb light. Used: offset, inkjet printing. Range: 0-100% per channel.
RGB → CMYK conversion patterns
R, G, B in the range of 0-255. Normalize: r=R/255, g=G/255, b=B/255. K = 1 - max(r,g,b). If K=1 (black): C=M=Y=0. Otherwise: C = (1-r-K)/(1-K), M = (1-g-K)/(1-K), Y = (1-b-K)/(1-K). Result × 100 = %. Note: conversion is approximate - exact conversion requires ICC profiles.
Why RGB and CMYK colors are different
Gamut: RGB has a wider color range than CMYK. Neon colors, bright saturation = often outside the CMYK gamut. Blue and purple are the hardest. Pantone: spot color system for precise printing (non-CMYK). Proof: always do a test print before tirazh. Soft proof: Photoshop → View → Proof Colors (CMYK simulation).
When to use RGB and when to use CMYK
RGB: websites, social media, presentations, TV, video. CMYK: offset printing (leaflets, posters, business cards, catalogues). RGB for printing: Home inkjet printers often accept RGB. Professional printing houses: always CMYK or Pantone. Print file format: PDF/X-1a or PDF/X-4 (with embedded CMYK profile).
Frequently asked questions
How to prepare a file for printing in CMYK?
Photoshop: Image → Mode → CMYK Color. InDesign: Document Setup → Intent: Print. Illustrator: File → Document Color Mode → CMYK. Check the gamut: Edit → Colors → Gamut Warning (Photoshop). ICC profile: FOGRA39 (Europe, Cretaceous), FOGRA47 (non-Cretaceous). Resolution: minimum 300 DPI.
What is Pantone and how does it differ from CMYK?
Pantone (PMS): spot color system with numbers. Pantone 286C = specific blue (always the same in every printing house). CMYK mixed: may vary between printers. When Pantone: company logo (consistency), color difficult to render in CMYK (e.g. neon orange). Cost: spot printing = more expensive (5th ink in the machine).
How to check if a color is in the CMYK gamut?
Photoshop: View → Gamut Warning (gray = out of gamut). Edit → Colors → Proof Setup → Working CMYK → Proof Colors. Colors out of gamut: the system approximates best. Adobe Color: select color → "Out of gamut" indicator. Rule of thumb: the less saturated the color, the safer it is. Black text: K=100 (not RGB 0,0,0).
What is overprint and how does it affect color?
Overprint: applying one color to another instead of knocking out. Black text: often an overprint (black prints on a background without knockout). Overprint Preview: Photoshop/InDesign → Overprint Preview. Error: white text with overprint = disappears! Always check the Overprint Preview in your print files. PDF/X: overprint settings preserved.
What is the difference between RGB #000000 and K=100?
RGB 0,0,0: solid black on screen. In CMYK: conversion gives C=0, M=0, Y=0, K=100. Rich black: C=60, M=40, Y=40, K=100 (deeper black for large surfaces). Registration black: