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Doc Bug #57984 Imagick::setImageCompression() has no effect
Submitted: 2007-12-30 16:20 UTC Modified: 2009-03-14 07:11 UTC
From: mail at hautzinger dot info Assigned:
Status: Not a bug Package: imagick (PECL)
PHP Version: 5.2.1 OS: gutsy gibbon
Private report: No CVE-ID: None
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 [2007-12-30 16:20 UTC] mail at hautzinger dot info 
Description:
------------
Imagick::setImageCompression() doesn't change the compression at all, besides wich (valid) value passed as parameter.

I use ImageMagick 6.3.7 with PHP 5.2.4-2 with Suhosin-Patch 0.9.6.2 (cli)

Reproduce code:
---------------
$img = new Imagick('test.jpg');

$img->setImageCompression(60);

$img->writeImage('test1.jpg');

Expected result:
----------------
jpg image should be compressed

Actual result:
--------------
nothing happens

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 [2007-12-31 05:47 UTC] mkoppanen@php.net 
Thank you for taking the time to write to us, but this is not
a bug.

Imagick::setImageCompression expects one of the compression type constants listed in:
http://php.net/manual/en/imagick.constants.php -> Compression constants.

If you want to set the compression quality 1-100 you need to use Imagick::setImageCompressionQuality.
 [2009-03-14 06:38 UTC] igor dot oszone at gmail dot com 
FreeBSD 7.1-RELEASE-p3
PHP Version 5.2.9 (mod_php5)
Suhosin Patch 0.9.7
ImageMagick version ImageMagick 6.4.9-8 2009-03-09 Q16 
imagick module version 	2.2.1

$img1 = new Imagick('upload/313/pNeDUU8F.jpg');
$img1->setCompression(Imagick::COMPRESSION_JPEG);
$img1->setCompressionQuality(40);
$s1= $img1->getImageSize();

$img2 = new Imagick('upload/313/pNeDUU8F.jpg');
$img2->setCompression(Imagick::COMPRESSION_JPEG);
$img2->setCompressionQuality(60);
$s2= $img2->getImageSize();

$img3 = new Imagick('upload/313/pNeDUU8F.jpg');
$img3->setCompression(Imagick::COMPRESSION_JPEG);
$img3->setCompressionQuality(90);
$s3= $img3->getImageSize();

$img4 = new Imagick('upload/313/pNeDUU8F.jpg');
$img4->setCompression(Imagick::COMPRESSION_JPEG);
$img4->setCompressionQuality(900);
$s4= $img4->getImageSize();

echo $s1." = ".$s2." = ".$s3." = ".$s4; 

==============
317983 = 317983 = 317983 = 317983

Replacing setCompression to setImageCompression does not change anything
 [2009-03-14 07:11 UTC] mkoppanen@php.net 
<?php

$img1 = new Imagick('test.jpg');
$img1->setImageCompression(Imagick::COMPRESSION_JPEG);
$img1->setImageCompressionQuality(40);
$img1->writeImage('output/1.jpg');

$img2 = new Imagick('test.jpg');
$img2->setImageCompression(Imagick::COMPRESSION_JPEG);
$img2->setImageCompressionQuality(60);
$img2->writeImage('output/2.jpg');

$img3 = new Imagick('test.jpg');
$img3->setImageCompression(Imagick::COMPRESSION_JPEG);
$img3->setImageCompressionQuality(90);
$img3->writeImage('output/3.jpg');

$img4 = new Imagick('test.jpg');
$img4->setImageCompression(Imagick::COMPRESSION_JPEG);
$img4->setImageCompressionQuality(900);
$img4->writeImage('output/4.jpg');

Generates:

22615 1.jpg
27045 2.jpg
31835 3.jpg
52126 4.jpg
 
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