You're either going to use memory, or spend a lot of time reading in the image
data during parse time.

If you want to save on memory usage, you could likely assign the image_map file
to the same identifier name every time, and that might keep the memory usage
down.

With regard to using the png + filename in an array, you no longer need to
specify the file type - POV-Ray will automagically detect that.

http://news.povray.org/povray.advanced-users/message/%3C5ba3b5f9%241%40news.povray.org%3E/#%3C5ba3b5f9%241%40news.povra
y.org%3E

http://news.povray.org/povray.animations/thread/%3Cweb.5c037ac5c84714c0730e3a270%40news.povray.org%3E/

You can also assign full pigment statements to array elements, thus ensuring
that they have the complete and correct syntax, and then reference those
fully-formed image_maps by name/index.

#declare _Array [1] = pigment {image_map {"Filename.png"} }

#macro macroName ()
     blah
     blah
     pigment {_Array [1]}
     blargety
     blech
#end

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