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Raster data is a grid of cells covering an area of interest. Each pixel, the smallest unit of information in the grid, displays a unique attribute.

An example of raster data is a scanned image or photograph. A line drawn in a raster format must be defined by a group of pixels along the length of the line. As a result the size of a raster file is larger than that required by a vector file.

Some formats that raster data can be stored in are;

cdr        CorelDraw                                                 pcx         PC Paintbrush
cpt        Corel Photopaint                                        png         Portable Network Graphics
eps        Encapsulated PostScript                             psd          Adobe PhotoShop
emf       Enhanced Metafile                                      tif           Tagged Image File format
fpx        Kodak FlashPix                                           tga          Targa file format
mix       PictureIt format                                          bmp        windows bitmap
hgl        HP Graphics Language                                wmf        windows metafile
jpg        JPEG filter                                                 wpg         WordPerfect Graphics
pcd        Kodak photo CD                                        gif           CompuServe Bitmap

There are many more formats and some of these are now dramatically reducing the size of the file and are attaching attributes to the pixels for processing by software packages.

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Last modified: February 11, 2000