Imagick::setCompressionQuality

(PECL imagick 2, PECL imagick 3)

Imagick::setCompressionQuality — Configura la compresión por defecto del objeto

Descripción

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

Configura la compresión por defecto del objeto.

Precaución

Este método solo funciona con nuevas imágenes, es decir, aquellas creadas con el método Imagick::newPseudoImage. Para imágenes existentes, debería utilizarse el método Imagick::setImageCompressionQuality().

Parámetros

quality: Un int entre 1 y 100, 1 = compresión alta, 100 compresión baja.

Valores devueltos

Devuelve true en caso de éxito.

Ejemplos

Ejemplo #1 Ejemplo con 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();
}

?>

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User Contributed Notes 3 notes

down

deeps chennai ¶

15 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 ¶

17 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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