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Imagick::setImageAlphaChannel — Sets image alpha channel
$mode
)
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。
mode
One of the Imagick::ALPHACHANNEL_* constants
成功时返回 TRUE。
错误时抛出 ImagickException。