Lossless image compression algorithms for continuous- tone images have received a great deal of attention in recent years. However, reports on benchmarking their performance have been Limited. In this paper, we present a comparative study of the follow- Ing algorithms: UNIX compress, gzip, LZW, Group 3, Group 4, JBIG, Old lossless JPEG, JPEG-LS based on LOCO, CALIC, FELICS, S+P transform, and PNG. The test images consist of two sets of Eight bits/pixel continuous-tone images: one set contains nine picto- Rial images, and another set contains eight document images, ob- Tained form the standard set of CCITT images that were scanned And printed using eight bits/pixel at 200 dpi.
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