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Raster or bitmapped images
use a grid of colors known as pixels to represent images. Each
pixel is assigned a specific location and color value. When
working with bitmap images, you edit pixels rather than objects or
shapes.
Bitmap images are resolution-dependent--that is, they
contain a fixed number of pixels. As a result, they can lose
detail and appear jagged if they are scaled on-screen or if they are
printed at a lower resolution than they were intended for.
from the Adobe Photoshop 6 User's Guide
Monitor resolution is the
number of pixels or dots displayed per unit of length on the monitor,
usually measured in dots per inch (dpi). Monitor resolution
depends on the size of the monitor plus its pixel setting. The typical
resolution of a PC monitor is 96 dpi; of a Mac OS Monitor 72
dpi.
from the Adobe Illustrator 9 User's Guide
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