only extract the specific page from the pdf file.overlay the signature with pdftk stamp to prevent image quality degradation.use stdbuf -oL and the -update option to have a live preview.Luckily I found this question and the script of Emmanuel Branlard contains the idea on how to do it (with xv). While putting my own signature commands into a shell script, I was looking for a way to interactively select the area where the signature should go. Network World: Using Gimp to modify PDF files.Instructables: Inserting an Image Into an Existing PDF And/or Converting Multiple Images to Pdf : 4 Steps.Text annotations and image additions to PDF file using free software.In the latter case i just print, sign, and scan again! See also Unfortunately this won't work if you need for example to sign every page of a multi page document. I do this regularly when i need to sign single page documents, and it takes me more or less five minutes. Open the signature on top of the document as a new layer (File -> Open as layer).Convert white to alpha in the signature if the background of the document is not white.
Apply a threshold on the signature if the white is not white enough.The latter is going to be in PDF format, that can be opened by Gimp You should have a file with the signature (even a picture taken with the phone or webcam), and a file with the document to be signed.Thus if you are familiar with GIMP, i would recommend trying it. Open PDF with GIMP and add the signature image A lot of people recommend Xournal, but i found it to work as a version of Gimp that i can't use.
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