Imagick::getImageChannelDistortions
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Imagick::getImageChannelDistortions — Gets channel distortions
说明
Imagick::getImageChannelDistortions (
Imagick
$reference ,
int $metric [,
int $channel = Imagick::CHANNEL_DEFAULT ] ) :
float
Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metrics 此方法在Imagick基于ImageMagick 6.4.4以上版本编译时可用。
参数
-
reference -
Imagick object containing the reference image
-
metric -
Refer to this list of metric type constants.
-
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 a double describing the channel distortion.
错误／异常
错误时抛出 ImagickException。
