pdftoppm in recent versions (0.26.4,5) seems to be incapable of
producing valid TIFFs, so have it dump a .pnm file and let ImageMagick
figure out how to convert it to TIFF. This is not ideal, but at least
it works.
convert .pnm -deskew <...> .pnm seems to have a bug that produces an
invalid .pnm file which later causes tesseract (specifically,
leptonica) to choke (using 3.02/1.71 as versions, respectively). Will
change pipeline to use tiffs internally since they are less stupid.
Put TESS_CFG_FILES last because it is optional and can be blank. If
omitted it breaks the sequence of subsequent parameters. Also cleanup
text output in this new mode.
If a page contains font data, the script would abort, unless -f was given,
in which case it would use pdftoppm to rasterize the font into a bitmap
and then attempt to OCR it. -f is almost certainly not what users want
unless they want to debug OCR or something.
If a PDF already has fonts it either was OCR'd already, or it is
a composite file containing, for example, some scanned documents appended
to a text report. In the latter case, this -s option provides OCR on
pages that don't have it without changing those that do, and if a PDF
was completely OCRed it will be converted to PDF/A. In batch jobs with
a mix of OCR and non-OCR the implicit conversion to PDF/A is also useful.
mktemp: consider both FreeBSD/OSX and Linux OS having incompatible
syntax
From now on temporary files are saved in the folder specified by the
environment variable $TMPDIR
self.width remains undefined unless hOCR finds text. It might not, if
a page contains only an image for example.
Full error message is:
AttributeError: ‘hocrTransform’ object has no attribute ‘width’
If deskew and/or cleanup is not requested, do not copy the files, but
just create symbolic link.
This saves disk place and makes the script slightly quicker
The x/y resolutions are not computed separately anymore.
We do not check anymore if x and y resolutions are different (not
measure could anyway be taken if they were not equal...)
Jim Barlow