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Tesseract's image processing is very rudimentary, in order to get the most out of it you need to use a preprocessor or use an image that's already been processed. A for humans perfectly readable image 100 dpi results in a huge number of failed characters even if source is free from physical scan artifacts (i.e. print to file). If possible, it's better to use 300 dpi image files. See More
The built in help is confusing, use man pages Does not work well with 100 dpi files, try 300 dpi if possible See More
Works great for me on snipped PNG files from the web, at significantly lower DPI. See More