One situation I encountered: I got terrible OCR results when I scanned
at 600dpi, great results on the same pages scanned at 300dpi. They were
clean pages, though, so I didn't have to do any cleaning.

Once I had the impression that some OCRs don't believe letters can be
this big [measured in pixels] if the scan is at a high enough resolution.

Tesseract explicitly says that it is geared towards 300 dpi scans.
For other OCR programs, the effect seems similar.

I suspect they're matching raster patterns, not outlines.
Probably because they want to cover 1-bit scans because that's what you get with fax, but I'm just guessing.

A list of frequently asked questions is available at:
--- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group.
To unsubscribe from this group and stop receiving emails from it, send an email 
To view this discussion on the web visit
For more options, visit

Reply via email to