Imagick::getImageChannelDistortion()
(PECL imagick 2.0.0)
Compares image channels of an image to a reconstructed image
说明
Imagick::getImageChannelDistortion(Imagick$reference,int $channel,int $metric):float
Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.
参数
- $reference
Imagick object to compare to.
- $channel
Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.
- $metric
One of the metric type constants.
返回值
成功时返回TRUE。
错误／异常
错误时抛出 ImagickException。