How can I detect color space of image is CMYK

I get error:

Error using readjpg (line 11) JPEG images with CMYK colorspace are not currently supported.

I have a huge amount of images. how can get to know if the color space is CMYK. I want to skip CmYK format files.

I write a code like this:

if size(image, 4) >1
Continue;
end

but does not work. My goal is use rgb2gray(). as it does not support CMKY, so I just want to skip any file in CMYK space. I try one CMYK file, it still in M*N*3 but not *4 dims. So I do not know how to judge.

[Yohai Devir]

Use imfinfo

Answer 1

[Image Analyst]

One way is to simply catch the error and continue

for k = 1 : numberOfFiles
    try
        rgbImage = imread(filename);
    catch
        continue;
    end
end

Answer 2

[Abdurrahman Tosun]

it is very easy to save this position. save to your image at paint program, after that convert to jpeg again by using paint program :) if this save you please let me know

[mike milhon]

Thanks, works. Opened with paint, and saved back, with yes to overwrite, and it worked. Had to do several in my set.