Appearance
A visible signature is a widget annotation with its own appearance stream. UniPDF
builds that stream from annotator.SignatureFieldOpts and a list of
annotator.SignatureLine, and nothing in it is read back from the signature, so the
box shows whatever you put there. Appearance field covers
position, font, colors and borders. Image appearance
adds a scanned signature image and a watermark.
The examples are in signatures/appearance.
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