Imagick::setCompressionQuality

(PECL imagick 2, PECL imagick 3)

Imagick::setCompressionQuality — Nesnenin 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.

Bağımsız Değişkenler

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 3 notes

down

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)

down

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);

?>

down

-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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