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(PECL imagick 2.0.0)
Imagick::getImageChannelDistortion — Compares image channels of an image to a reconstructed image
$reference
, int $channel
, int $metric
)Compares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.
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.
成功时返回 TRUE 。
错误时抛出 ImagickException。