I have not done much myself with image manipulation with Perl, however, the first thing I thought of was Gimp, and as it turns out, there is a nice intro to controlling Gimp with Perl here -> Gimp-Perl

I have found Gimp to be very capable of handling any image work in almost any format(with what little I have done with image manipulation).

In spite of this being a shot in the dark, I hope that might be helpful.