Imagick::getImageChannelDistortions

(PECL imagick 2 >= 2.3.0, PECL imagick 3)

Imagick::getImageChannelDistortions — Gets channel distortions

说明

public 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 float describing the channel distortion.

错误／异常

错误时抛出 ImagickException。