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Add image or text on top of a one-page PDF
Authored by: Cealus on Jan 12, '11 01:59:51PM

While one can always take a screenshot at 72dpi, the problem is far worse. If you add a signature by the above method, and then open the resulting pdf with Adobe Reader and click the signature with the selection tool (don't click and drag), it will select the signature. Then when the tool changes to a black pointer, drag to the desktop. When I do this, I get the hi-res full sized signature as a tiff file, the same size and resolution as what I used to sign the document in the first place (although I used a png to create the pdf).

The only way I found around this problem is to open the pdf in Preview, select the page with my signature, drag it to the desktop, and open it with Preview as a second file. Convert this second file to a tiff, drag it back into Preview and use it to replace the page with the signature. Saving this back as a pdf with Preview yields a document with a signature page which although can be copied doesn't allow for hijacking your signature, other than in low-res.

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