Imagick::getImageAlphaChannel

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Imagick::getImageAlphaChannel — Gets the image alpha channel

int Imagick::getImageAlphaChannel ( void )

Gets the image alpha channel value. The returned value is one of the alpha channel constants. 此方法在Imagick基于ImageMagick 6.4.0以上版本编译时可用。

Returns a constant defining the current alpha channel value. Refer to this list of alpha channel constants.

错误时抛出 ImagickException。