OCR old software listing

Toby Thain toby at telegraphics.com.au
Mon Dec 31 08:35:53 CST 2018

On 2018-12-31 7:20 AM, Larry Kraemer via cctalk wrote:
> I used the libtiff-tools (Debian 8.x - 32 Bit) to extract all 61 .TIF's
> from the
> Multipage .tif file.  While the .tif's look descent, and RasterVect shows
> the
> .tif properties to be Group 4 Fax (1bpp) with 5100 x 6600 pixels - 300 DPI,
> I can't get tesseract 3.x, TextBridge Classic 2.0, or Irfanview with KADMOS
> Plugin to OCR any of the .tif files, with descent results.  I'd expect an
> of 85 to 90 % correct conversion to ASCII text.
> Typically, one of the three above Software packages will do a descent job
> of OCRing .tif's of such scans.  (Most PDF's end up at 72 x 72 DPI, and
> converting them to 300 DPI, allows them to be properly OCR'd.)
> If anyone else has had better luck, I'd like to know what your process is.

I don't know if OCR software is sensitive to having correct resolution
(I've practically zero experience with it), but 300 dpi seems wrong for
Mattis' scans.

Seems they should be 600 dpi (21.7 cm x 28 cm).


> Thanks.
> Larry

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