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Viewing Image File Differences
You can diff image files to compare differences between file versions.
You can see obvious differences when you compare images side by side or top over bottom. In the following example, the images are shown in side-by-side view. Notice the light blue stripes in the image on the left are not in the image on the right.
Viewing combined differences shows the result of subtracting the pixel values of one image from the other. In the following example, you can see what changed in the image.
Another change was made to the image that you cannot see when you view images using the previous options. Viewing high contrast combined differences shows you the high contrast result of subtracting the pixel values of one image from the other. This view is helpful to compare tone differences between images that are difficult to see. In the following example, you can see that a change was made to the dog's tongue.