The Imagick::getImageChannelDistortion() function is an inbuilt function in PHP which is used to compare image channels of an image to a reconstructed image and returns the specified distortion metric.
Syntax:
float Imagick::getImageChannelDistortion( Imagick $reference,
int $channel, int $metric )
Parameters: This function accept three parameters as mentioned above and described below:
- reference: It specifies the Imagick object to compare with.
- channel: It specifies the channel constant that is valid for your channel mode. To apply more than one channel, combine channeltype constants using bitwise operators.
- metric: It specifies one of the metric type constants. List of METRIC constants are given below:
- imagick::METRIC_UNDEFINED (integer)
- imagick::METRIC_MEANABSOLUTEERROR (integer)
- imagick::METRIC_MEANSQUAREERROR (integer)
- imagick::METRIC_PEAKABSOLUTEERROR (integer)
- imagick::METRIC_PEAKSIGNALTONOISERATIO (integer)
- imagick::METRIC_ROOTMEANSQUAREDERROR (integer)
Exceptions: This function throws ImagickException on error.
Return Value: This function returns TRUE on success.
Below programs illustrate the Imagick::getImageChannelDistortion() function in PHP:
Program 1:
<?php   // Create two new imagick object $imagick1 = new Imagick( $imagick2 = new Imagick(   // Get the distortion with METRIC constant as imagick::METRIC_MEANABSOLUTEERROR $distortion = $imagick1->getImageChannelDistortion($imagick2, 0, 1); echo $distortion; ?> |
Output:
122728
Program 2:
<?php   // Create two new imagick object $imagick1 = new Imagick( $imagick2 = new Imagick(   // Get the distortion with METRIC constant // as imagick::METRIC_MEANABSOLUTEERROR $distortion = $imagick1->getImageChannelDistortion($imagick2, 0, 1); echo $distortion; ?> |
Output:
0
Note: In the second example output comes 0 because both of the image are same.
Reference: https://www.php.net/manual/en/imagick.getimagechanneldistortion.php
