I wish to use this took for commercial use, by which I mean developing a static application(using Perl/Tk) for an inhouse project in my company.

I'm not a lawyer, but if I read the introduction to the license text I don't see what the problem with using Image::Magick would be. Even if you distributed the resulting program.

In fact, if you don't distribute the program outside of your own organization, you can probably (this is not legal advice) even use GPL'd software.

Ps: also take a look at GD