Sets the object's default compression quality

# Imagick::setCompressionQuality

(PECL imagick 2, PECL imagick 3)

Imagick::setCompressionQuality — Sets the object's default compression quality

### 说明

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

Sets the object's default compression quality.

警告

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

### 参数

`quality`

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

### 返回值

成功时返回 `true`。

### 示例

示例 #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();
    }

    ?>

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