How to extract a specific text from an image?

How to extract text from an image using PHP

• Let's say I have an image which consists of white background and black text. How to extract text from the file and save it as png with transparent backgorund using PHP?

• Answer:

  If you already have an image using a color palette (gif or png) and assuming the top left pixel is white anyway, you could simply use: $im = imagecreatefrompng($filename); imagecolortransparent($im, imagecolorat($im, 0, 0)); Otherwise you'd have to iterate over pixels, find the whiteish ones (jpeg) and set them each. Some more examples are here: http://www.php.net/manual/en/function.imagecolortransparent.php