Cumulus provides a smart option that allows you to compare two image assets. A visual representation of the comparison result as well as the previews of the compared assets are presented in fullscreen preview.

The comparison is done on a pixel-by-pixel base, i.e. any pixel in the preview of an asset is compared to the according pixel in the preview of the other asset. The comparison result is computed – and displayed – as the difference of the RGB values of the corresponding pixels. Pixels that are identical in both images appear as black in the comparison result.

If the two images to be compared have the same aspect ratio but different sizes, the larger one is scaled down to the size of the smaller one. If the images differ both in size and aspect ratio, they are overlaid centered.

Compare Previews is especially useful for detecting subtle differences in apparently identical image assets.