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Understanding Image Types

Another thing you need to know about images on the Mac is that there are two main “families” of computer graphic applications: raster-based programs and vector-based programs. Some graphics programs, and some graphics file formats created by such programs, may not fall neatly into one family or the other, but the difference between the two is essential to understanding how a Mac represents and stores images.

Understanding Raster-Based Graphics

Raster-based graphics, also commonly called bitmap images, break down an image into a grid of pixels. Each pixel is assigned a numerical value that represents the brightness and color value of that pixel. The numerical values are used both to display the image on the Mac's monitor and to store the image on disk.


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