1. A method of processing and storing screenshot images, the method comprising: receiving, using a computer system, an image, the image depicting a screenshot of results of an application test; comparing, using the computer system, the image to a plurality of reference images; selecting, using the computer system, a reference image that is the most similar to the image; generating, using the computer system, a delta image representing a difference between the reference image and the image; storing, using the computer system, the delta image with a reference to the reference image; and balancing, using the computer system, a number of reference images stored in a reference area with a number of delta images stored in a delta area to maintain one or more of: a predetermined ratio of reference images to delta images; or a predetermined ratio of average delta image size to average reference image size.