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"Lenna", a cropped photograph from a 1972 issue of Playboy magazine of centerfold model Lena Soderberg, is one of the most widely known and published test images.

A standard test image is a digital image file used across different institutions to test image processing and image compression algorithms. By using the same standard test images, different labs are able to compare results, both visually and quantitatively. The images are in many cases chosen to represent natural or typical images that a class of processing techniques would need to deal with. Other test images are chosen because they present a range of challenges to image reconstruction algorithms, such as the reproduction of fine detail and textures, sharp transitions and edges, and uniform regions.

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Common test images

The standard size of the images are usually 512x512 or 720x576. Most of these images are freely available as TIFF files from the University of Southern California's Signal and Image Processing Institute.[1] Kodak has released a set of 24 768×512 images, available as PNGs, that are widely used for comparing image compression techniques.[2]

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