greek langage letter

[Quetzaal]

hi, i've dowload and add "greek" OCR for tesseract, in tessdata (grc.traineddata) ... and it is available in python pytesseract print(pytesseract.get_languages(config='')) => ['ell', 'eng', 'equ', 'fra', 'frm', 'grc', 'lat', 'osd']

but, the OCR of a png-wiki-greek-page, do not send any greek letter... may i do something wrong... it's not o long time i use pytesseract, but it works fine in FR, EN, LAT... then why not greek ?

thanks for you anwser & explanation