MATLAB: How can i check that the image is rgb

rgb2gray

i need to use rgb2gray func. but first i need to check that my image is rgb or grayscale..like this :
        if XXXXXX
        c1=rgb2gray(a);
        c=imadjust(c1);
        else
        c=imadjust(a);
        subplot(2,3,1),imshow(a),title('original');
        subplot(2,3,2),imshow(c),title('option 1');
        end
what should i use insted of XXXXXX ?

Best Answer

Hi
if size(a,3)==3
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