set density parameter for imagick with php

Question

I want to convert a pdf page to a png image with Imagick.

I tried with PHP, but the image quality was very low.
When I tried with command line, the result was perfect.

PHP code

$im = new imagick( __DIR__ . DIRECTORY_SEPARATOR.$PDFName.'['.$i.']' );  
$params = $im->identifyImage();
$width = $params['geometry']['width']*1;
$height = $params['geometry']['height']*1;
$im->setResolution(400,400);
$im->resizeImage($width ,$height, imagick::FILTER_SINC, 1, true);
$im->writeImage(__DIR__ . DIRECTORY_SEPARATOR.'pdf_pages\\'.$i.'.png'); 
$im->clear(); 
$im->destroy();

Command line code

convert -density 400 a.pdf -resize 25% -a.png

PHP code (2nd attempt)

$im = new imagick( __DIR__ . DIRECTORY_SEPARATOR.$PDFName.'['.$i.']' );  
$im->setOption('density','400x400');
$im->setOption('resize','25%');
$im->writeImage(__DIR__ . DIRECTORY_SEPARATOR.'pdf_pages\\'.$i.'.png'); 
$im->clear(); 
$im->destroy();

Still bad results.

What can I do? I want to use the density parameter in my PHP code, but how?

Output with PHP enter image description here

Output with command line enter image description here

Also, if the PHP API fails to get you what you need, you can always resort back to using `exec` or `shell_exec` to execute the command and generate the file you need. — dakdad, Dec 26 '12 at 02:46

score 29 · Accepted Answer · answered Aug 29 '13 at 21:34

29

You need to set Resolution before you read the file.

$im = new imagick();
$im->setResolution(200,200);
$im->readImage(__DIR__ . DIRECTORY_SEPARATOR.$PDFName.'['.$i.']');

Than, the result will be perfect.

Hope this help someone.

answered Aug 29 '13 at 21:34

Simon Arnold

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score 5 · Answer 2 · edited May 23 '17 at 11:47

5

From the manual http://php.net/manual/en/imagick.setresolution.php

Imagick::setResolution() must be called before loading or creating an image.

See this answer Pdf to image using php-imagick api

edited May 23 '17 at 11:47

Community

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answered Dec 26 '12 at 02:43

dakdad

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set density parameter for imagick with php

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