subtracting images processing,

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im trying to subtract two images with the same format in matlab, but unfortunatly im getting the image to dark i cant see anything so what i can do to change im sending the code below
clc, clear; close all;
%read image
a= imread('pentan1h_6uLmin_0240.tif');
b= imread('pentan1h_6uLmin_0250.tif');
c=imsubtract(a,b);
subplot(2,2,1),imshow(a),title('dry')
subplot(2,2,2),imshow(b),title('pen')
subplot(2,2,3),imshow(c),title('after')
this is the picture im getting

Accepted Answer

KALYAN ACHARJYA
KALYAN ACHARJYA on 20 Apr 2019
Edited: KALYAN ACHARJYA on 20 Apr 2019
If you see the result image, its not exactly compleyely dark. If you subtract the similar pixel elements, definitely you get the black pixels (zero). I don't seems there is any issue with result, as most part of the both suntract images are same. There are minor differences in both images, which are reflected in result image (see some non black pixels).
One Suggestion: If the images same type, make it double then do the subtraction.
What is your aim to doing so?

More Answers (2)

Image Analyst
Image Analyst on 20 Apr 2019
Try [] to scale your data to your display
imshow(c, []);

wan noor
wan noor on 14 Dec 2019
Try use iamabsdiff function so that you will always have a non negative result.
  1 Comment
Image Analyst
Image Analyst on 14 Dec 2019
or imadjust() to scale the intensities to the 1% points of the histogram tails.

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