Article: Computer Graphics: They're Not All The Same
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Computer Graphics: They're Not All The Same
Graphic images on your computer come in two different forms, raster images and vector images. Raster images are made by programs such as Photoshop and Corel Photopaint. Vector images are produced by Adobe Illustrator, Freehand, and CorelDraw. While the results from these different programs can look similar, the ways in which they are made are very different.
Raster images are made up of millions of individual squares, or pixels, of various colors. The more pixels you have, the better the image will look. The number of pixels, or resolution, is usually expressed in dots per inch (dpi). Images on the Web are shown at 72 dpi. A high-resolution image would run 300 dpi or higher. Some types of printing can get into the 1600 dpi range. Much like a mosaic, a raster image can look s...
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