Image::Magick can write PDFs. It looks like you could convert a series of PNGs (or whatever) into a PDF. Also, you might be to skip GD and add the text to the image in Image::Magick.

Disclaimer: I have not tried this. YMMV.

In reply to Re^3: Adding text to an image for printing by RonW
in thread Adding text to an image for printing by tel2

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