MATLAB: Image from RGB to another one

color space conversionImage Processing Toolboxrgb to cmyk

I have two Questions :

•1. Read the RGB image?

•2. Convert RGB color image into CMYK color image?

I solve the first one

             figure 
             image_mat = imread('color.jpg');
             imshow(image_mat)

but How can i solve the second one ?

Best Answer

Did you even try the function in the link KSSV gave you? Because I did, and the attached code worked just fine.

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MATLAB: How to convert the 4-channel CMYK image data to gray scale for image processing

There are no built-in MATLAB functions for converting 4-channel CMYK data directly to grayscale. But it can be done in two steps:

Step 1:

Read the original image and convert the data from the CMYK colorspace to the RGB colorspace, using the MAKECFORM and APPLYCFORM functions. This requires an appropriate ICC color profile, such as the "USSheetfedCoated.icc" color profile from the Adobe Systems, Inc. (www.adobe.com).

Using this profile, the conversion can be executed as follows:

I_cmyk = imread('foo.tif');   
inprof = iccread('USSheetfedCoated.icc');
outprof = iccread('sRGB.icm');
C = makecform('icc',inprof,outprof);
I_rgb = applycform(I_cmyk,C);

where "foo.tif" is the TIF-file to be converted.

STEP 2:

Use the RGB2GRAY function to convert the resulting RGB image to grayscale:

I_gray = rgb2gray(I_rgb);

MATLAB: How to convert CMYK image to RGB

If the CMYK data is in the same colorspace as the USSheetfedCoated.icc profile (or if it is just to visualize the data), then it is sufficient to reverse the input and output profiles given to MAKECFORM as in the following example:

inprof = iccread('USSheetfedCoated.icc');
outprof = iccread('sRGB.icm');
C = makecform('icc',inprof,outprof);
I_rgb = applycform(I_cmyk,C);

The best results are obtained by using CMYK and RGB profiles that describe the colorspaces of the image and destination device.

Best Answer

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MATLAB: How to convert the 4-channel CMYK image data to gray scale for image processing

MATLAB: How to convert CMYK image to RGB

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