An eye doctor can compare photographs taken at different times to monitor the progression of the disease and evaluate the effectiveness of treatment.

To establish your innocence, ask the police to compare the prints and photographs with those of the imposter.

She decides to experiment and asks the computer to compare photographs of thousands of hands, with surprising - and frightening - results.

A similar way of tracking glacier change is comparing photographs of the glacier's position at different times.

He opened his briefcase and compared aerial photographs with the maps.

The feature compares newly uploaded photographs to those of the uploader's Facebook friends, in order to suggest photo tags.

"If you'll compare photographs of fifteen days ago, you'll see it's less active now."

Change detection often involves comparing aerial photographs or satellite imagery of the area taken at different times.

By comparing photographs obtained on slightly different orbits or times, the topography of the body is revealed.

Another approach is to compare photographs of a star at different times against a large background of more distant objects.