Handle captchas with unix command line tools imagemagick and tesseract-ocr. This is the result of playing around in lunch break.
This is captcha i tried to get the text value of. Therefor i once pushed it through imagemagick to get the tiny fractals away.
convert securimage_show.php.png -fuzz 40% -fill red -opaque white result
sudo tesseract result -psm 8 captcha_txt
Tesseract is able to read the second image and writes the text uwCzDv to file captcha_txt.
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