The TikZ and PGF Packages
            Manual for version 3.1.9a
          
          Libraries
53 Fading Library
TikZ Library fadings ¶
              \usepgflibrary{fadings} %
                LaTeX
                and plain
                TeX
                and pure pgf
              \usepgflibrary[fadings] % ConTeXt and pure pgf
              \usetikzlibrary{fadings} %
                LaTeX
                and plain
                TeX
                when using TikZ
              \usetikzlibrary[fadings] % ConTeXt when using TikZ
              
              The package defines a number of fadings, see Section 23
              for an introduction. The
              TikZ version defines special
              TikZ commands for creating fadings.
              These commands are explained in Section 23.
            
| Fading name | Example (solid blue faded on checkerboard) | 
| west |   | 
| east |   | 
| north |   | 
| south |   | 
| circle with fuzzy edge 10 percent |   | 
| circle with fuzzy edge 15 percent |   | 
| circle with fuzzy edge 20 percent |   | 
| fuzzy ring 15 percent |   |