My earlier successes were definitely font related. Use a blacklist, or 
whitelist....

-c tessedit_char_blacklist=fifl

https://groups.google.com/d/topic/tesseract-ocr/jO_4ZMMK9xw/discussion

On Saturday, September 3, 2016 at 1:45:21 PM UTC-4, fuzzy7k wrote:
>
> It's a language thing: https://en.wikipedia.org/wiki/Typographic_ligature
>
> Try specifying a specific language?
>
> This parameter seems like a possible association (due to the description 
> containing glyph): 
> segment_penalty_dict_nonword    1.25    Score multiplier for glyph 
> fragment segmentations which do not match a dictionary word (lower is 
> better).
>
> Let me know what you find. I had this occur recently but have been chasing 
> other issues and haven't verified a solution.
>
>
> On Saturday, September 3, 2016 at 5:23:55 AM UTC-4, Brais Gabín Moreira 
> wrote:
>>
>> Hi, I'm trying to train tesseract. But text2image creates a single box 
>> for 'fi' or 'fl'. Why it thinks that 'fi' or 'fl' are a single character 
>> instead of two? How can I fix this?
>>
>

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