Re: [Gimp-user] GIMP, .pdf, and threshold

My initial guess would be that your image mode is Indexed.

Check Image>>Mode and make sure it is set to RGB after importing the images.


From: gimp-user-list <gimp-user-list-bounces gnome org> on behalf of m roth 5-cent us <m roth 5-cent us>
Sent: 11 April 2016 15:40
To: gimp-user-list gnome org
Subject: [Gimp-user] GIMP, .pdf, and threshold

Hi, folks,

   I'm running CentOS 6.7, and the most current GIMP for that, 2.6.9-8. A
friend, half a continent away, is scanning parts of a number of old
'zines for me. From that, The originals were printed on colored

    I want to do OCR. On a couple of .pdfs, one I d/l from the 'Net, and
one from a different scanner, I import it into GIMP as images (we're
talking 16-20pp), and, page by page, push the contrast to max, cut the
brightness to half or less of what it was, then pull up threshold, and
the preview shows me black text on white, and saving it that way,
tesseract works just fine.

   Doing that with these scans, nada. No useful changes, and threshold
does nothing.

   Clues for the poor?


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