(PECL imagick 2, PECL imagick 3)
Imagick::compareImageChannels — Returns the difference in one or more images
Compares one or more images and returns the difference image.
imageImagick object containing the image to compare.
channelTypeProvide 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.
metricTypeOne of the metric type constants.
Array consisting of new_wand and
distortion.
错误时抛出 ImagickException。