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With dithering, pixels of two colors are juxtaposed to create the illusion that a third color is present. The process of reducing many colors to 256 or fewer is called dithering.
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Ditheringįull-color photographs can contain an almost infinite range of color values gif images can contain no more than 256 colors. 11.4).įigure 11.4 - The LZW compression built into the GIF graphic format is very good at efficiently saving diagrammatic graphics (right) but poor at compressing more complex photographic images (left). It is much less efficient at compressing complicated “photographic” pictures with many colors and complex textures (fig. The lzw compression scheme is best at compressing images with large fields of homogeneous color, such as logos and diagrams. The gif file format uses a relatively basic form of file compression ( Lempel Ziv Welch, or lzw) that squeezes out inefficiencies in data storage without losing data or distorting the image. However, gif files are 8-bit graphics and thus can only accommodate 256 colors. gif files incorporate a “lossless” compression scheme to keep file sizes at a minimum without compromising quality. Many images on the web are in gif format, and virtually all web browsers that support graphics can display gif files. In the early 1990s the original designers of the World Wide Web adopted gif for its efficiency and widespread familiarity. The CompuServe Information Service popularized the Graphic Interchange Format ( gif) in the 1980s as an efficient means to transmit images across data networks.
#File formats for pictures onwebsites pro#
Bitmap files are the familiar types of files produced by cell phone and digital cameras, and are easily created, edited, resized, and optimized for web use with such widely available tools as Adobe’s Photoshop or Elements, Corel’s Paint Shop Pro and Painter, and other photo editing programs.įor efficient delivery over the Internet, virtually all web graphics are compressed to keep file sizes as small as possible. All three common web graphic formats are so-called bitmap graphics, made up of a checkerboard grid of thousands of tiny colored square picture elements, or pixels. The primary web file formats are gif (pronounced “jiff”), jpeg (“jay-peg”), and, to a much lesser extent, png (“ping”) files.