Search for a tool
CMYK Channels

Tool to decompose an image in print colors. The separation of the CMYK channels (for the 4 colors Cyan, Magenta, Yellow and Key for Black) is used to analyze the colors of each part of an image.

Results

CMYK Channels -

Tag(s) : Image Processing

Share
dCode and more

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Thanks to your feedback and relevant comments, dCode has developed the best 'CMYK Channels' tool, so feel free to write! Thank you!

# CMYK Channels

## Cyan/Magenta/Yellow/Black Channels Separation

 Output channel As grayscale With their own color

### How to separate CMYK values of an 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 kightly visible

Example: The dominant yellow is very visible

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.

### How to calculate CMYK values from RGB values?

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:

$$K = 1-max(R, G, B) \\ C = (1-R-K) / (1-K) \\ M = (1-G-K) / (1-K) \\ J = (1-B-K) / (1-K)$$

### Why 'K' in CMYK?

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)

## Source code

dCode retains ownership of the online 'CMYK Channels' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'CMYK Channels' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'CMYK Channels' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'CMYK Channels' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

## Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!