Imagick::getImageChannelDistortions

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

Imagick::getImageChannelDistortions — Gets channel distortions

說(shuō)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以上版本編譯時(shí)可用。

參數(shù)

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. 缺省為Imagick::CHANNEL_DEFAULT. 參考此通道常數(shù)列表

返回值

Returns a double describing the channel distortion.

錯(cuò)誤／異常

錯(cuò)誤時(shí)拋出 ImagickException。