Imagick::getImageChannelDistortions

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Imagick::getImageChannelDistortions — Gets channel distortions

说明

float Imagick::getImageChannelDistortions ( Imagick $reference , int $metric [, int $channel = Imagick::CHANNEL_DEFAULT ] )

Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metrics This method is available if Imagick has been compiled against ImageMagick version 6.4.4 or newer.

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. Defaults to Imagick::CHANNEL_DEFAULT. Refer to this list of channel constants

返回值

Returns a double describing the channel distortion.

错误/异常

Throws ImagickException on error.