PHP | Imagick separateImageChannel() function

The Imagick::separateImageChannel() function is an inbuilt function in PHP which is used to separate a channel from the image and returns a grayscale image. A channel is a particular color component of each pixel in the image.

Syntax:

bool Imagick::separateImageChannel( int $channel )

Parameters:This function accepts a single parameter $channel which holds the integer value corresponding to one of the CHANNEL constants.

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.

Below programs illustrate the Imagick::separateImageChannel() function in PHP:

Program 1:

<?php

// Create a new imagick object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png');

// Separate the image channel
$imagick->separateImageChannel(1);

// Display the image
header("Content-Type: image/png");
echo $imagick->getImageBlob();
?>

Output:

Program 2:

<?php

// Create a new imagick object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png');

// Apply selectiveBlurImage() function
$imagick->separateImageChannel(imagick::CHANNEL_GREEN);

// Display the image
header("Content-Type: image/png");
echo $imagick->getImageBlob();
?>

Output:

Reference: https://www.php.net/manual/en/imagick.separateimagechannel.php