The basic design of how graphics are represented

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The basic design of how graphics are represented

Post by jancancook on Thu Nov 10, 2011 9:05 am

The basic design of how graphics are represented in PDF is very similar to that of PostScript, except for the use of transparency, which was added in PDF 1.4.
PDF graphics use a device independent Cartesian coordinate system to describe the surface of a page. A PDF page description can use a matrix to scale, rotate, or skew graphical elements. A key concept in PDF is that of the graphics state, which is a collection of graphical parameters that may be changed, saved, and restored by a page description. PDF has (as of version 1.6) 24 graphics state properties, of which some of the most important are:
The current transformation matrix (CTM), which determines the coordinate system
The clipping path
The color space
The alpha constant, which is a key component of transparency


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