The GIF format uses the LZW compression algorithm, which was patented by Unisys, and publishers of applications that read and write GIF87a and GIF89a images were required to obtain a license and pay ...

Friday 20 June has been dubbed Gif Liberation Day as net users the world over celebrate the end of a costly patent agreement. The patent for the Lempel-Ziv-Welch, or LZW, compression algorithm is set ...

Images transmitted over the world wide web are an excellent example of why data compression is important. Suppose we need to download a digitized color photograph over a computer's 33.6 kbps modem. If ...