# Gmagick::setCompressionQuality

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

### 说明

Gmagick::setCompressionQuality( int `$quality` ): Gmagick

Sets the object's default compression quality.

### 参数

`quality`
  The GraphicsMagick default value is 75.

### 返回值

The Gmagick object.

### 错误／异常

错误时抛出 GmagickException。

### 示例

示例 #1 Gmagick::setCompressionQuality()

`<?php
$gm = new Gmagick();
$gm->read("magick:rose");
$gm->setCompressionQuality(2);
?>`
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