The app will highlight the small differences that might otherwise be undetectable at first, or which you might not notice even if you studied the images very closely.
For example, with this app, you can compare two similar photos and find the small differences that would not otherwise be immediately obvious.
You simply have to select the two images you want to compare and they will appear in the main window. Once you have selected the images, the differences will then be highlighted in the image you have selected as the main one, so you can instantly identify them.
A dialog box will also appear where you can specify the level of similarity between the images and the percentage of difference between the pixels you want to detect, among other things.