Tool to decompose an image in print colors. The separation of the CMYK channels (for the 4 ink colors Cyan, Magenta, Yellow and Key for Black) is used to analyze the colors of each part of an image.
CMYK Channels - dCode
Tag(s) : Image Processing
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In printing, CMYK are the initials of the 4 primary four-color process colors, namely: Cyan, Magenta, Yellow and (K) Black. Any image can be decomposed into 4 superimposable color channels to reform the original image.
The image will be analyzed in printing color components (4 layers). There are four main colors when printing: Cyan, Magenta, Yellow and Black.
The result will be returned in grayscale for each color. Between 0 for no color and 1 for pure color.
Example: The dCode logo do not have any Cyan (light blue)
Example: For magenta the C is very visible
Example: The yellow is dominating the whole image
Example: The black draws the contours of the image
In order to accelerate the calculation of channel separation, the image will be resized if it is too large.
From RGB values $ R $, $ V $ and $ B $ between $ 0 $ and $ 1 $ (divide by 255 if the values are between 0 and 255)
CMYK values are calculated using formulas:
$$ K = 1-max(R, G, B) \\ C = (1-R-K) / (1-K) \\ M = (1-G-K) / (1-K) \\ J = (1-B-K) / (1-K) $$
In English, CMYK (instead of CMYB) stands for Cyan, Magenta, Yellow and Black. To not use the B letter for Black (as B stands for Blue in RGB code), term Key is preferred (the black component is often the most important when printing: the key)
dCode retains ownership of the "CMYK Channels" source code. Except explicit open source licence (indicated Creative Commons / free), the "CMYK Channels" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "CMYK Channels" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "CMYK Channels" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
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Cite as source (bibliography):
CMYK Channels on dCode.fr [online website], retrieved on 2024-11-05,