Hi all,

We have working code based on

org.apache.pdfbox.examples.pdmodel.RubberStampWithImage

which inserts jpeg b/w signatures with white backgrounds into pdf docs.  Now we 
need to refine this to make the white background transparent.  I see that 
PDJpeg.getRBGImage() makes use of soft masks:

     // If there is a 'soft mask' image then we use that as a transparency mask.

[Soft masks are new item for me.] My question is:

Has anyone made use of this, and if so, do you have advice for me, and/or 
examples you could provide?

Many thanks in advance,
Ken

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