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Imagick::setCompressionQuality

(PECL imagick 2, PECL imagick 3)

Imagick::setCompressionQualityNesnenin öntanımlı sıkıştırma seviyesini tanımlar

Açıklama

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

Nesnenin öntanımlı sıkıştırma seviyesini tanımlar

Dikkat

Bu yöntem sadece, Imagick::newPseudoImage gibi yöntemlerle yeni oluşturulmuş görüntüler üzerinde çalışır. Eski görüntüler için Imagick::setImageCompressionQuality() yöntemi kullanılmalıdır.

Değiştirgeler

seviye

1-100 arasında bir tamsayı, 1 = çok sıkıştırma, 100 = az sıkıştırma.

Dönen Değerler

Başarı durumunda true döner.

Örnekler

Örnek 1 - Imagick::setCompressionQuality() örneği

<?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();
}

?>

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User Contributed Notes 4 notes

up
28
deeps chennai
11 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
11 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
13 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();
}

?>
up
-10
sebastian dot moser at gmail dot com
14 years ago
Use this example to see how image compression works:

<?php
// load an image
$img = new Imagick("test.jpg");

// compression methods, see "Contants"-page for Imagick
$img->setComression(Imagick::COMPRESSION_JPEG);
// a value between 1 and 100, 1 = high compression, 100 low compression
$img->setComressionQuality(80);

// set content type
header("Content-type: image/jpeg");
// write image
echo $img->getImageBlob();
?>
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