Posted by
Gluender-4 on
Aug 09, 2010; 3:30pm
URL: http://imagej.273.s1.nabble.com/Compare-two-gray-value-pictures-tp3687310p3687313.html
Dear Anna Klaus!
>Hello Gluender,
>
>Thank yor for your quick answer!
>I think in my case it would be the best to compare each pixelvalue with each
>other...! The mean value would not give me the information I want!
>i try to solve my problem in ImageJ or in Matlab...I do not know which one
>would be easier, ....but I also do not know how to tell the programm to
>solve my problem:(!
Here we go:
I assume that you like to compare two 8bit (monochromatic) images.
1.
Open both images in ImageJ
2.
From the "Process" menu select item "Image Calculator"
3.
Select the proper images for Image1 and 2 and as Operation "Subtract"
4.
Make sure the following check boxes are both checked
5.
Click OK and you will get a new image.
6.
Make sure the new image is in the foreground
7.
From the "Image" menu select item "Adjust > Threshold"
8.
In the opening dialog there are two pop-up menus.
Set them to "Default" and "Red"
9.
Click the "Set" button
10.
Enter -255 for the "Lower Threshold Level" and 0 for the "Upper
Threshold Level"
11.
Click OK and close the threshold dialog.
12.
Make the Result window with the negative values marked in red the
frontmnost window.
13.
From the "Image" menu select item "Type > RGB Color"
14.
Save the result window.
There are other ways to perform the task, e.g. by using a suitable LUT.
HTH
--
Herbie
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