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Beginning with PDF 1.3 there is also a shading pattern, which draws continuously varying colors.There are seven types of shading pattern of which the simplest are the axial shade (Type 2) and radial shade (Type 3).
Based on the Post Script language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it.
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.
Linear PDF files (also called "optimized" or "web optimized" PDF files) are constructed in a manner that enables them to be read in a Web browser plugin without waiting for the entire file to download, since they are written to disk in a linear (as in page order) fashion.
PDF files may be optimized using Adobe Acrobat software or QPDF.The basic design of how graphics are represented in PDF is very similar to that of Post Script, except for the use of transparency, which was added in PDF 1.4.