Imagick::getImageChannelDistortions()

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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。