DiffImg

Subtle differences between two images are very difficult to spot. If you don't like pixel hunting, you should use a specialized program. If you analyze your images with DiffImg, it will be much easier to spot any differences. Besides the fact that it provides a user friendly interface, which is very easy to understand, the application highlights the differences it detects and it allows you to switch between different view modes.

DiffImg is distributed as a freeware application. You can use it on Windows XP, Vista and Windows 7 and certain Linux distributions. The installation package is small, so you can download and install the application in just a few moments.

When launched, DiffImg will prompt you to select a base image and one for comparison. Images are loaded instantly, in the central region of the interface and you may select different options, located on a toolbar, to switch between the original image and the modified one. You can also enable a dual panel view mode, for a side by side comparison.

To make differences easier to spot, the application places a color mask, on the modified images, to highlight differing pixels. One of the most helpful features is the difference view mode. If selected, the application will display nothing but differing pixels, on a grey background.

You can access the general settings menu and change the opacity level for an error mask, which is particularly useful when you switch to the difference view mode. Additionally, you may tick an option, in the same settings menu, to allow differences with an RMS threshold of your choice. It is also possible to select other computing methods, for difference detection.