Imagick::setCompressionQuality

(PECL imagick 2, PECL imagick 3)

Imagick::setCompressionQualitySets the object's default compression quality

Descrizione

public Imagick::setCompressionQuality(int $quality): bool

Sets the object's default compression quality.

Attenzione

This method only works for new images e.g. those created through Imagick::newPseudoImage. For existing images you should use Imagick::setImageCompressionQuality().

Elenco dei parametri

quality

An int between 1 and 100, 1 = high compression, 100 low compression.

Valori restituiti

Restituisce true in caso di successo.

Esempi

Example #1 Imagick::setCompressionQuality()

<?php
function setCompressionQuality($imagePath, $quality) {

$backgroundImagick = new \Imagick(realpath($imagePath));
$imagick = new \Imagick();
$imagick->setCompressionQuality($quality);
$imagick->newPseudoImage(
$backgroundImagick->getImageWidth(),
$backgroundImagick->getImageHeight(),
'canvas:white'
);

$imagick->compositeImage(
$backgroundImagick,
\Imagick::COMPOSITE_ATOP,
0,
0
);

$imagick->setFormat("jpg");
header("Content-Type: image/jpg");
echo
$imagick->getImageBlob();
}

?>

add a note

User Contributed Notes 3 notes

up
30
deeps chennai
14 years ago
A note for people who just couldn't get this working..

With PHP 5.1.6, the below works:

<?php
$img
->setCompression(Imagick::COMPRESSION_JPEG);
$img->setCompressionQuality(80);
?>

However, with higher versions of PHP (I tried on PHP 5.2.10), the code has no effect (and there are no exceptions or warnings thrown by Imagick as well).

The code that works instead is:

<?php
$img
->setImageCompression(Imagick::COMPRESSION_JPEG);
$img->setImageCompressionQuality(80);
?>

and this is backwards compatible (Works on PHP 5.1.6 as well as 5.2.10)
up
5
charles dot hall at sas dot com
14 years ago
I had to insert a call to "stripImage()" in order to actually see the filesize shrink.

<?php
$img
= new Imagick();
$img->readImage($src);
$img->setImageCompression(imagick::COMPRESSION_JPEG);
$img->setImageCompressionQuality(90);
$img->stripImage();
$img->writeImage($dest);
?>
up
-4
nVaux.com
16 years ago
Sebastian's example works excellent, just one minor spelling mistake, it will give you an error otherwise.

<?php
$img
->setCompression(Imagick::COMPRESSION_JPEG);
$img->setCompressionQuality(80);
?>

I used Sebastians example, and made one that compresses all the images within a directory:

<?php
$images
= new Imagick(glob('images/*.jpg'));

foreach(
$images as $image)
{
// compression methods, see "Contants"-page for Imagick
$image->setCompression(imagick::COMPRESSION_JPEG);
// a value between 1 and 100, 1 = high compression, 100 low compression
$image->setCompressionQuality(80);
$image->writeImage();
}

?>
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