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Define raster11/28/2022 ![]() BMP, TIFF, GIF and JPEG are some of the raster image file formats available. The raster file is sometimes referred to as a bitmap because it contains information that is directly mapped to the display grid. ) A raster image file identifies which of these coordinates to illuminate in monochrome or color values. (And for three-dimensional images, a z coordinate. Fortunately, there are already image compression techniques and algorithms that have been made to address that problem. A raster is a grid of X and Y coordinates on a display space. Since raster graphics store much information, they require large file sizes and they can be a bit of a hassle to work with. Vector graphics are better suited for typesetting and graphic design. Each cell contains an attribute value and location coordinates. Vector graphics, on the other hand, is able to scale up to any resolution because of it uses geometry and mathematical equations to define images rather than directly mapping pixels in a grid. Rasters are spatial data models that define space as an array of equally sized cells, arranged in rows and columns, and composed of single or multiple bands. The image will look blocky and pixelated. It can be scaled down with no changes in quality, but when the resolution is scaled up, quality loss is unavoidable. The main disadvantage of raster graphics is that it is dependent on resolution. Pixels can be edited but it takes a lot more effort and skill. The word raster was borrowed from the term 'raster scan,' which was how old CRT monitors displayed images, by magnetically steering a concentrated electron beam line by line to form an image. This is a close-up visual of how pixels look compared to nodes in a vector image. ![]()
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