User Guide

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Image resolution
Raster images are saved as groups of
pixels at a fixed resolution. In contrast,
vector drawings are saved as mathemat-
ical expressions, and display at the res-
olution available to the output device.
The image resolution refers to the spac-
ing of pixels in the raster image, and is
measured in pixels per inch (ppi).
See Bitmap images and About vector
graphics and bitmap images.
Note: The Document Info dialog box
enables you to define the output resolu-
tion for vector drawings. In Illustrator,
output resolution refers to the number
of line segments the PostScript inter-
preter uses to approximate a curve. For
more information, see Changing the
output resolution.