PHP Manual
Imagick
Sets image alpha channel

Imagick::setImageAlphaChannel

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Imagick::setImageAlphaChannel — Sets image alpha channel

说明

Imagick::setImageAlphaChannel ( int $mode ) : bool

Activate or deactivate image alpha channel. The mode is one of the Imagick::ALPHACHANNEL_* constants. 此方法在Imagick基于ImageMagick 6.3.8以上版本编译时可用。

参数

mode: One of the Imagick::ALPHACHANNEL_* constants

返回值

成功时返回 TRUE。

错误／异常

错误时抛出 ImagickException。

参见

Imagick::setImageMatte() - Sets the image matte channel
Imagick Alpha Channel Constants

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