(PECL imagick 2, PECL imagick 3)
Imagick::getImageChannelDistortion — Compares image channels of an image to a reconstructed image
$reference
, int $channel
, int $metric
) : floatCompares one or more image channels of an image to a reconstructed image and returns the specified distortion metric.
referenceImagick object to compare to.
channelProvide 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.
metricOne of the metric type constants.
成功时返回 true。
错误时抛出 ImagickException。