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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.

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CMYK Channels -

Tag(s) : Image Processing

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# CMYK Channels

## Cyan/Magenta/Yellow/Black Channels Separation

 Output channel As grayscale With their own color
 Channel to extract Cyan Channel (C) Magenta Channel (M) Yellow Channel (Y) Black/Key Channel (K)
 Resolution 0.1 Megapixel (fast) 0.5 Megapixel (web) 1 Megapixel (quality)

### What are CMYK channels in an image? (Definition)

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.

### 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 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.

### 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 the letter '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)

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CMYK Channels on dCode.fr [online website], retrieved on 2022-12-09, https://www.dcode.fr/cmyk-channels

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