On Linux try YAGF, it is a GUI front end for Tesseract.  As zdenop said, 
you have a unicode problem.  You need to use UTF8 for strings.

On Friday, October 17, 2014 6:07:26 AM UTC-4, Salvo Piazza wrote:
>
> Hi Zdenko,
> thanks for your response.
>
> I know tesseract at very beginning level, so can you tell me how can I 
> check it? (I use a Linux version of tesseract...)
>
> Thanks,
> Salvo.
>
>
> Il giorno giovedì 16 ottobre 2014 21:46:31 UTC+2, zdenop ha scritto:
>>
>> fl is recognizes as ligature in English, so there could be the same issue 
>> in Italian. If it is replaced with '?' I would guess you have problem with 
>> unicode... Can you check it with tesseract executable?
>>
>> Zdenko
>>
>> On Thu, Oct 16, 2014 at 10:18 AM, Salvo Piazza <
>> [email protected]> wrote:
>>
>>> Hi all,
>>> I've written a little simple program to extract text from image with 
>>> tesseract 3.0.2 as:
>>>
>>> Tesseract instance = Tesseract.getInstance();
>>> instance.setDatapath(currentDir);
>>> instance.setLanguage("ita");
>>> String returner = instance.doOCR(new File(filename));
>>>
>>> It works fine but I've many question mark chars '?' in the extracted 
>>> text.
>>>
>>> For example the word *fluidi *is recognized as *?uidi *and much more 
>>> example...
>>>
>>> Does anyone know some tips in order to fix this behaviour?
>>>
>>> Thanks in advance,
>>> Salvo.
>>>
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>>

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