Comparison of two pdf files

Question

I need to compare the contents of two almost similar files and highlight the dissimilar portions in the corresponding pdf file. Am using pdfbox. Please help me atleast with

Answer 1

I had this very problem myself and the quickest way that I've found is to use PHP and its bindings for ImageMagick (Imagick).

compareImages($im2, \Imagick::METRIC_MEANSQUAREERROR);

if($result[1] > 0.0){
    // Files are DIFFERENT
}
else{
    // Files are IDENTICAL
}

$im1->destroy();
$im2->destroy();

Of course, you need to install the ImageMagick bindings first:

sudo apt-get install php5-imagick # Ubuntu/Debian