Imagick::getImageChannelRange
(PECL imagick 2.2.1)
Imagick::getImageChannelRange — Gets channel range
说明
Imagick::getImageChannelRange (
int
$channel ) :
array
Gets the range for one or more image channels. 此方法在Imagick基于ImageMagick 6.4.0以上版本编译时可用。
参数
-
channel -
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channel constants using bitwise operators. 缺省为
Imagick::CHANNEL_DEFAULT. 参考此 通道常数列表
返回值
Returns an array containing minima and maxima values of the channel(s).
错误／异常
错误时抛出 ImagickException。
