ART

• Extension: art
• Company: AOL
• Samples: http://samples.mplayerhq.hu/image-samples/ART/
• Wikipedia page: http://en.wikipedia.org/wiki/ART_image_file_format (has some interesting links)

ART is an image format used on the America OnLine (AOL) service. The file format originated with a company named Johnson-Grace and was later acquired by AOL. Allegedly, the format is able to employ a number of different compression techniques depending on the characteristics of the image data.

File Format

Integers seem to be in little-endian format.

0x00     (  +2) ASCII characters "JG", likely for Johnson-Grace
...
0x0D     (  +2) width
0x0F     (  +2) height