Well, I'm just going to do:
- one-time image processing
- only thumbnail generation, maybe addition of some kind of text like watermark

Well, I like Image-Magick, because it has easy-to-install binary release for Windows, while netpbm requires using Mingw32 and GNU Bash. So cross-platform development I do a fine Windows release is necessary.

http://archive.develooper.com/macosx@perl.org/msg03943.html
"The downside to NetPBM is that all of the tools work with only the
PBM or PPM formats, so you need to get your images into this format
first. But there's usually a NetPBM tool to convert your image into
PBM, as well as to convert it from PBM to your desired final format
after you've manipulated it."

Also is there a Perl API for netpbm? I did not see any... And using system() or backticks (`command`) is not a good idea.
Image Magick has several ones like Image::Magick, PerlMagick, Apache::ImageMagick.

Finally how about GD package?

Best regards,
Webmaster33

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