How do I convert a PDF document to a preview image in PHP?
What libraries, extensions etc. would be required to render a portion of a PDF document to an image file?
Most PHP PDF libraries that I have found center around creating PDF documents, but is there a simple way to render a document to an image format suitable for web use?
Our environment is a LAMP stack.
You need ImageMagick and GhostScript
<?php
$im = new imagick('file.pdf[0]');
$im->setImageFormat('jpg');
header('Content-Type: image/jpeg');
echo $im;
?>
The [0] means page 1 .
For those who don't have ImageMagick for whatever reason, GD functions will also work, in conjunction with GhostScript. Run the ghostscript command with exec() to convert a PDF to JPG, and manipulate the resulting file with imagecreatefromjpeg() .
Run the ghostscript command:
exec('gs -dSAFER -dBATCH -sDEVICE=jpeg -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r300 -sOutputFile=whatever.jpg input.pdf')
To manipulate, create a new placeholder image, $newimage = imagecreatetruecolor(...) , and bring in the current image. $image = imagecreatefromjpeg('whatever.jpg') , and then you can use imagecopyresampled() to change the size, or any number of other built-in, non- imagemagick commands
You can also get the page count using
$im->getNumberImages();
Then you can can create thumbs of all the pages using a loop, eg.
'file.pdf['.$x.']'
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