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GIF streams start with a screen descriptor that defines image resolution and color depth, followed by an optional global color map (palette). GIF uses LZW (Lempel-Ziv-Welch) compression. GIF images are paletted with up to 256 colors. Each color is a 24 bit RGB value. Animated GIFs. A GIF file can contain more than one image.GIF streams start with a screen descriptor that defines image resolution and color depth, followed by an optional global color map (palette). GIF uses LZW (Lempel-Ziv-Welch) lossless compression. GIF images are paletted with up to 256 colors. Each color is a 24 bit RGB value. Animated GIFs. A GIF file can contain more than one image.Internet service provider CompuServe introduced GIF (Graphics Interchange Format) in 1987 as a format to transmit images with up to 256 different colors. In 1989 a revised specification was published that added some features to the format.Internet service provider CompuServe introduced GIF (Graphics Interchange Format) in 1987 as a format to transmit images with up to 256 different colors. In 1989 a revised specification was published that added some features to the format. Introduced in 1995 as a free alternative to Unisys's greedy patent claim on the GIF format, PNG was slow to be adopted by companies like Microsoft so the format did not catch on right away. Today PNG is supported by all the major web browsers. PNG uses deflate compression and is sometimes preprocessed in a way that helps it compress better.Introduced in 1995 as a free alternative to Unisys's greedy patent claim on the GIF format, PNG was slow to be adopted by companies like Microsoft so the format did not catch on right away. Today PNG is supported by all the major web browsers. PNG builds on the idea of transparency in GIF images and allows the control of the degree of transparency, known as opacity. PNG uses deflate compression and is sometimes preprocessed in a way that helps it compress better. PNG does not support animation like GIF does.=== Cartoons, Drawings, or Clipart That's 256 Colors or Less ===<big>Use: PNG</big><BR>''recommended file extension'': *.png'''Reason''': === Animated Graphics for the Web ===<big>Use: GIF</big><BR>''recommended file extension'': *.gif'''Reason''': === Grayscale Photographs or Web Images ===<big>Use: </big><BR>''recommended file extension'': *.'''Reason''': === CMYK Images For Professional Printing ===<big>Use: </big><BR>''recommended file extension'': *.'''Reason''': === Raster and Mask Images for Game Animation ===<big>Use: </big><BR>''recommended file extension'': *.'''Reason''':