Error reports that there is no png function in GD::Image...
It probably means that when your copy of libgd was built, the required library for png support was not available.
P.S. i forgot to ask... what does rgb2n function do? and will it work without it?
Most of the color related methods in GD are for use with palettised images, where you allocate a palette entry with the RGB value for that color, and get a palette index returned. You then supply that index to the drawing commands.
For truecolor (24-bit color) images, you supply the RGB value, as an integer, directly to the drawing commands.
rgb2n() does the job of converting an RGB triple into an integer in the right format for truecolor images.
There might even be some built-in function for doing the same job, but if there is, it isn't obvious from the docs.
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