Enfocus PitStop Pro 11 Level B, 1Y, Maintence Informations techniques Page 111

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7. Editing objects
7.1 About line art and pixel images
Categories of computer graphics
There are two main categories of computer graphics:
Line art
on page 111
Pixel images
on page 112
These types of graphics behave differently in PDF documents and you can manipulate each of these
graphics differently. Understanding their different characteristics will help you understand their
different behavior when working with PDF documents.
Line art
Line art is made up of mathematically defined curves and line segments called vectors. These
vectors describe graphics according to their geometric characteristics and as a series of lines in
a x,y coordinate system of the lines origins and endings.
For example, a slanted line can be described as a line drawn from coordinate h0 to coordinate a8
with a specific line thickness and a specific angle of inclination.
Figure 19: A vectorized representation of a slanted line.
You can edit line art by moving and resizing the entire graphic or the lines and segments that
compose the graphic.
Line art is resolution independent: you can scale the graphic to any size or print it on any output
device at any resolution without losing quality, detail or clarity.
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