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');

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

    $img->setResolution(300,300);

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

    $data = $img->getImageBlob(); 

my source pdf file has right dimension (210×297 mm, like A4 has). And everything looks good.
But my jpg has page dimension as 842×595 px, and DPI is 72.

and img file much more smaller on paper then pdf, when i had print it.

what is a proper way to make image file from pdf and make it so big as pdf (on paper)

Answer 1

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.