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$pdf_file = './pdf/demo.pdf';

$save_to = './jpg/demo.jpg';

//make sure that apache has permissions to write in this folder!

//(common problem)

//execute ImageMagick command 'convert' and convert PDF

//to JPG with applied settings

exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);

if($return_var == 0) {

//if exec successfuly converted pdf to jpg

print "Conversion OK";

}

else print "Conversion failed.".$output;