differece image of 2 images

How to calculate difference image of 2 images read from different folders?

[Rik]

If they are the same size you can just subtract one from the other. What have you tried so far?

[Bjorn Gustavsson]

And just to be clear, subtraction between data of for example uint8 might give you unwanted results, cast the images to doubles before subtracting:

diff_img1 = img1 - img2;
diff_img2 = double(img1) - double(img2);
% compare the two as you see fit

Answer 1

[Subhadeep Koley]

MATLAB provides imabsdiff function to find the absolute difference of two images. The following code might help you.

% read image from folder 1 
image1=imread('yourImage1.png'); 
% read image from folder 2 
image2=imread('yourImage2.png'); 
% calculate the absolute difference 
absDiffImage=imabsdiff(image1,image2); 
% plot the absolute difference image 
figure; 
imshow(absDiffImage,[]); 
colormap(jet); 
colorbar;