I would not just copy and paste the code you need. Create a local directory on your machine and save the CPAN files (which should be available in an archive format) on your hard drive or locker space or whatever is the easiest.

Right. This is the right answer nearly all the time, I think. In this case particularly, modules that deal with images are very complex, usually use xsubs, and so on. Cutting-and-pasting is not likely to work out well.

One question I have (for the OP) is "why targa (.tga)?" That's one of the odder and more difficult formats to work with. GD supports PNG (IMHO, the best format for this case), JPEG and so forth, and PerlMagick/ImageMagick.pm supports .tga and many others, but is much more difficult to install than GD. For starters I would recommend working in the PNG format, doing any pre-conversion of .tga to .png necessary.

-- 
Cynicism is not "cool" or "hip" or "intelligent". It's like Saddam Hussein's piss mixed
with 004 grit and nitric acid. It's corrosive to everything it touches, destructive to
human endeavors, foul and disgusting. And ultimately will eat away the insides of the
person who nurtures it.