robbat2: (Default)
[personal profile] robbat2
Just documenting this again, so I don't forget it, and it might help others too.

Specifically, how to make a PDF with transparency, using ImageMagick, so that it can be used as a stamp for PDFTK. This requires a PNG with transparency as input.

convert $INPUT.PNG -transparent white -background none $OUTPUT.PDF
pdftk $FORM.PDF stamp $OUTPUT.PDF output $COMPLETED_FORM.PDF
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