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What is Bitmapped?


A bitmap is a mapping from some domain (for example, a range of integers) to bits, also called a bitmap index or bit array.

A font or graphic image is made up of a pattern of pixels in a rectangular grid. Bitmaps are aliased. The stairstep effect is produced by the square shape of the pixels, and thus the effect is enhanced by enlarging the image.

The term "bitmap" is often used to refer to a particular bit mapping application: the pix-map, which refers to a map of pixels. In that case, the domain in question is the array of pixels that constitute a digital graphic output device (a screen or monitor). In some contexts, the term bitmap means one bit per pixel, while pixmap is used for images with multiple bits per pixel.

The bitmap is a type of memory organization or image file format used to store digital images. The term bitmap comes from the computer programming terminology, meaning a map of bits, a spatially mapped array of bits. Now, with pixmap, it usually refers to the same concept of a spatially mapped array of pixels. Raster images in general in files or memory may be referred to as bitmaps or pixmaps, whether synthetic or photographic.

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