Used in simple Paintbrush utilities. PICT PBM,PGM,PPM Portable BitMap formats. TGA TrueVision Targa Files Delevoped by Amiga, used in Gamming and some graphics applications. Compression Address the problem of reducing the amount of data required to represent an image or video or some other data type. There are a huge variety of data compression techniques, but only a few have been standardized.
Compression is an active area of research in the computer field.
It is the compression algorithm used in the GIF graphics file format, which is one Web. The patent for LZW is owned by Unisys, which for many years allowed anyone to use the algorithm for free. Then in 1995, Unisys suddenly decided to charge a license fee. There was an uproar from the Compuserve and Web communities, and Unisys backed down somewhat, though they still enforce the licensing requirement for commercial applications. There are already some other browsers that support PNG natively.