PDF to JPG conversion using PHP

Question

I\'m trying to convert PDF to IMG (JPG) with help PHP.

I\'m using imagick extension.

this is my code

    $fp_pdf = fopen($pdf, \'rb\');

             


        

Answer 1

As mentioned before, setting the resolution before reading the file does the trick:

$fp_pdf = fopen($pdf, 'rb');

$img = new imagick(); // [0] can be used to set page number
$img->setResolution(300,300);
$img->readImageFile($fp_pdf);
$img->setImageFormat( "jpg" );
$img->setImageCompression(imagick::COMPRESSION_JPEG); 
$img->setImageCompressionQuality(90); 

$img->setImageUnits(imagick::RESOLUTION_PIXELSPERINCH);

$data = $img->getImageBlob(); 

Answer 2

You could use imagemagick through exec() or similar, the shell arguments are much less verbose than the PHP extension.

$pdf_file = escapeshellarg( "mysafepdf.pdf" );
$jpg_file = escapeshellarg( "output.jpg" );

$result = 0;
exec( "convert -density 300 {$pdf_file} {$jpg_file}", null, $result );

// at this point $result should == 0 if the conversion was successful

It's the "-density" (which sets the DPI to read the source file as) option that specifically fixes your problem.

Also imagemagick by default uses a -quality setting of 92 for JPEG writing in most cases - so you probably don't need to explicitly declare it.

Answer 3

You have to call setResolution before reading the image. Otherwise imagemagick will use the default system dpi.

Answer 4

ImageMagick uses GhostScript to process JPEGs, so you'd do better to exec GhostScript directly, which would be much more efficient and give you more control. It would also be only 1 exec statement, instead of playing around with the IMagick functions.

Answer 5

It looks like you missed two setters:

Imagick::setImagePage() http://www.php.net/manual/en/function.imagick-setimagepage.php

And:

Imagick::setImageExtent() http://www.php.net/manual/en/function.imagick-setimageextent.php

In order to get the correct parameters for these functions, you may try the following:

$fp_pdf = fopen($pdf, 'rb');
$params=array();

    $img = new imagick(); 
    $img->readImageFile($fp_pdf);
    /*my modification: */$img->setImageUnits(imagick::RESOLUTION_PIXELSPERINCH);
    /*my modification: */$params=$img->identifyImage();
    $img->setImageFormat( "jpg" );
    $img->setImageCompression(imagick::COMPRESSION_JPEG); 
    $img->setImageCompressionQuality(90); 
    /*my modification: */$img->setPage($params['geometry']['width'], $params['geometry']['height'], 0, 0)
    /*my modification: */$img->setResolution($params['resolution']['x'], $params['resolution']['y']);
    $img->setImageUnits(imagick::RESOLUTION_PIXELSPERINCH);
    $data = $img->getImageBlob();

If you find that some others attributes should be set, then let me show you the information that $params is holding. It may proof useful for you:

$params=array(
    [imageName],
    [format], 
    [geometry] => Array
        (
            [width]
            [height] 
        )
    [type], 
    [colorSpace], 
    [resolution],
        (
            [x] 
            [y]
        )

    [units],
    [fileSize],
    [compression],
    [signature], 

)

To be honest, I'm not completely sure if this will work. Is just a try in order to help you. I sincerely hope it does.