Documentation for ruamel.pdfdouble
this package provides the pdfdbl command:
pdfdbl scan dir1 dir2
This will walk down the directories provided as argument and for the PDF files found, create a hash based on (in order):
- metadata if unique - images if the number of images matches the number of pages - text
This assumes that pdfinfo, pdfimages and pdftotext` from the poppler-utils package are avaialable.
A “database” is build up in ~/.config/pdfdbl/pdf.lst against which further scans are tested.
In ruamel/pdfdouble/pdfdouble.py there are two methods that can be enhanced to filter out markings in the PDF that make them less unique and make virtually the same files to have different hashes.
For text the method PdfData.filter_for_marking should be extended to remove and markings from the string that is its arguments and return the result.
For scanned images the method PdfData.process_image_and_update needs to be enhanced, e.g. by cutting off the images bottom and top X lines, and by removing any gray background text by setting all black pixels to white. This function needs to update the hash passed in using the .update() method passing in the filtered data.
The current “database” cannot handle paths that contain newlines
This utility is currently Python 2.7 only.
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