MATLAB: How to convert tiff image into gray image

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how to convert tiff image into gray image? I tried rgb2gray but it show me an error about "RGB must be a m x n x 3 array" my tiff image is (m x n x 4)

Best Answer

Your image has a transparency channel in addition to the three colour channels. If you don't want to do anything with the transparency information, just discard it:
 img(:,:,4) = [];
 %proceed with rgb2gray
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