Matlab，图像大小相同，但我不能使用imabsdiff

Question

I want to use imabsdiff in matlab to find the difference between two images. when I use it I have this error on the terminal (X and Y are the images)

X and Y must be the same size.

but my problem is that when I use size function for checking the size of images one of them is 512, 512 and another one is 512, 512, 3

I have no idea about this, what should I do? :(

thanks in advance :)

Answer 1

It sounds like one of the images is grayscale and the other is colour (3 channels). One solution is to make both images grayscale rgb2gray and then run imabsdiff

imgA = ...;   % The 3 channel image (size [512, 512, 3])
imgB = ...;   % The single channel image (size [512, 512])
imabsdiff(rgb2gray(imgA), imgB);