PHP | Imagick getImageChannelExtrema() Function
Last Updated :
20 Nov, 2019
The Imagick::getImageChannelExtrema() function is an inbuilt function in PHP which is used to get the extrema for one or more image channels. Extrema are the points at which a maximum or minimum value of a function is observed. It returns an associative array with the keys “minima” and “maxima”.
Syntax:
array Imagick::getImageChannelExtrema(int $channel)
Parameters: This function accepts single parameter $channel which specifies the channel constant that is valid for your channel mode. Use bitwise operator to combine channeltype constants.
Exceptions: This function throws ImagickException on error.
Return Value: This function returns TRUE on success.
Below programs illustrate the Imagick::getImageChannelExtrema() function in PHP:
Program 1:
<?php
$imagick = new Imagick(
$extrema = $imagick ->getImageChannelExtrema(0);
print_r( $extrema );
?>
|
Output:
Array ( [minima] => 0 [maxima] => -9223372036854775808 )
Program 2:
<?php
$imagick = new Imagick(
$extrema = $imagick ->getImageChannelExtrema(6);
print_r( $extrema );
?>
|
Output:
Array ( [minima] => 5654 [maxima] => 65535 )
Reference: https://www.php.net/manual/en/imagick.getimagechannelextrema.php
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