Bug#985887: gscan2pdf: saves b&w scanned pages in inverted mode

[Francesco Potortì]

>Did the new version of PDF::Builder solve the problem?

Yes, it did, without any further change.  I have created the pdf and the
log files at http://fly.isti.cnr.it/tmp/gscan2pdf with exactly the same
procedure as before.

>Did selecting compression=Auto or compression=Flate solve the problem?

I had not time to try it at the moment, and now my library is updated
and everything works alright.  However, I enabled compression=Auto and
created a further log and pdf, which you find in the same place.

By the way, I have no "Flate" compression to choose.  I have Auto, LZW,
Zip, Packbits, G3, G4, PNG, JPEG, None.

Thanks for your work

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