P4V lets you diff the following image file types:
You can compare two different image files or two revisions of the same image. In both cases, P4V launches P4Merge, where you can navigate the differences between the specified images.
For more information, see View image differences in the P4Merge User Guide.
To diff two different image files:
Alternatively, in the Depot or Workspace tree, or in the Files tab, you can drag one image file’s icon onto another.
To diff two revisions of the same image file:
Alternatively, you can drag one of the desired revisions onto the other revision.