01
Declare the approximation
Normalize each CMYK percentage by 100. Multiply 255 by one minus the relevant ink component and one minus black. Quantize the three positive channels once, with half ties upward. The HEX value uses those same integers.
Image ToolsFREE · NO SIGNUP
CMYK to RGB Converter
Convert four CMYK percentages to approximate RGB channels, uppercase HEX and a screen swatch. No ICC profile or print-match promise.
FREE TO USEA LOOK ATLAS TOOL
01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Preview four ink percentages on screen.
DECLARED RESULT
Approximate RGB
RGB 179, 128, 77Approximate screen color only. No ICC profile or print-match guarantee.
Not a profiled print proof.
UPPERCASE HEX#B3804D
RED / GREEN / BLUE179 / 128 / 77
naive CMYK → sRGB approximation; quantize each channel half-up once
11
COLOR WITH A DECLARED LIMIT
Preview four ink percentages on screen.
Approximation only; not an ICC/press/paper/ink conversion, Pantone match, proof or guaranteed print reproduction. CMYK is device-dependent; an RGB preview cannot predict a printed sample. W3C Color5 is a Working Draft, not Recommendation. Do not present CSS examples as defining this product's8-bit rounding.
WORKING VIEW
#B3804DCMYK 12.5 · 37.5 · 62.5 · 20
METHODnaive CMYK → sRGB approximation; quantize each channel half-up once
WORKING NOTEUnrounded RGB 178.5, 127.5, 76.5 becomes RGB 179, 128, 77 after one half-up quantization.
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
CMYK 12.5 · 37.5 · 62.5 · 20#B3804D
Unrounded RGB 178.5, 127.5, 76.5 becomes RGB 179, 128, 77 after one half-up quantization.
02
Check the half-channel example
CMYK 12.5, 37.5, 62.5, 20 gives unrounded RGB 178.5, 127.5, 76.5. The declared half-up rule yields RGB 179, 128, 77 and uppercase #B3804D.
03
A screen swatch is not a print proof
CMYK is device-dependent. This generic calculation does not read an ICC profile, ink, paper, dot gain or printer settings. It cannot promise a Pantone match or predict a printed sample. W3C CSS Color 5 is a Working Draft; 8-bit quantization is this product's declared policy.
04
Keep color and raster geometry separate
After choosing a preview color, prepare declared print dimensions separately with the image DPI converter. Check the final raster's pixel dimensions with the image size checker; a color conversion does not change its size.
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Declare the approximation
Normalize each CMYK percentage by 100. Multiply 255 by one minus the relevant ink component and one minus black. Quantize the three positive channels once, with half ties upward. The HEX value uses those same integers.
Check the half-channel example
CMYK 12.5, 37.5, 62.5, 20 gives unrounded RGB 178.5, 127.5, 76.5. The declared half-up rule yields RGB 179, 128, 77 and uppercase #B3804D.
A screen swatch is not a print proof
CMYK is device-dependent. This generic calculation does not read an ICC profile, ink, paper, dot gain or printer settings. It cannot promise a Pantone match or predict a printed sample. W3C CSS Color 5 is a Working Draft; 8-bit quantization is this product's declared policy.
Keep color and raster geometry separate
After choosing a preview color, prepare declared print dimensions separately with the image DPI converter. Check the final raster's pixel dimensions with the image size checker; a color conversion does not change its size.
Questions, answered.
Does this match a printed CMYK color?
No. This is a generic screen approximation without an ICC profile, press, paper or ink model. Use color-managed proofing for print matching.
How are RGB and HEX rounded?
Each RGB channel is quantized once to the nearest integer, with exact positive half ties rounded upward. HEX uses those same integers and uppercase letters.
Can I upload a CMYK image?
No. Enter four decimal percentages. This tool does not convert image files or profiles.
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