Image RGB to CMYK : Image Conversion - MATLAB Code (RGB to CMYK, CMYK to RGB)

MATAB use makecform and applycform functions to perform this color model conversion 

Ref: makecform: https://www.mathworks.com/help/images/ref/makecform.html

Ref: applycform: https://www.mathworks.com/help/images/ref/applycform.html

RGB to CMYK:

I_rgb = imread('lena_color.jpg'); %Read the color image 

C = makecform('srgb2cmyk');     %srgb (standard rgb) to cmyk 

I_CMYK= applycform(I_rgb,C);

TO SAVE IN CMYK Format

imwrite(I_CMYK, 'test.tiff');

USE IMFINFO to confirm the conversion

imfinfo('test.tiff')

the command gives the output

...

Width: 512

Height: 512

BitDepth: 32

ColorType: 'CMYK'

...

CMYK to RGB:

I_CMYK = imread('lena_color.jpg'); %Read the color image 

C = makecform('cmyk2srgb');     %srgb (standard rgb) to cmyk 

I_rgb= applycform(I_CMYK, C);