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 The `png` terminal driver supports Portable Network Graphics.  To compile it,
 you will need  the third-party libraries "libpng" and "zlib"; both are
 available at http://www.cdrom.com/pub/png/.  `png` has four options.

 By default, the `png` terminal driver uses a shared Web-friendy palette.

 Syntax:
       set terminal png {small | medium | large}
                        {transparent | notransparent}
                        {monochrome | gray | color}
                        {<color0> <color1> <color2> ...}

 `transparent` instructs the driver to generate transparent PNGs.  The first
 color will be the transparent one.

 The defaults are small (fontsize) and color.  Default size of the output
 is 640*480 pixel. 

 Each color must be of the form 'xrrggbb', where x is the literal character
 'x' and 'rrggbb' are the red, green and blue components in hex.  For example,
 'x00ff00' is green.  The background color is set first, then the border
 colors, then the X & Y axis colors, then the plotting colors.  The maximum
 number of colors that can be set is currently 99.