PHP | Imagick setImageChannelDepth() Function

PHP | Imagick separateImageChannel() function

Last Updated : 17 Dec, 2019

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

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