PHP | Gmagick separateimagechannel() Function
Last Updated :
14 Jan, 2020
The Gmagick::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:
Gmagick Gmagick::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 Gmagick object on success.
Exceptions: This function throws GmagickException on error.
Below given programs illustrate the Gmagick::separateimagechannel() function in PHP:
Used Image:
Program 1 (Separating the RED channel):
<?php
$gmagick = new Gmagick( 'geeksforgeeks.png' );
$gmagick ->separateimagechannel(Gmagick::CHANNEL_RED);
header( "Content-Type: image/png" );
echo $gmagick ;
?>
|
Output:
Program 2 (Separating the Green channel):
<?php
$gmagick = new Gmagick( 'geeksforgeeks.png' );
$gmagick ->separateimagechannel(Gmagick::CHANNEL_GREEN);
header( "Content-Type: image/png" );
echo $gmagick ;
?>
|
Output:
Program 3 (For a drawing):
<?php
$gmagick = new Gmagick( 'geeksforgeeks.png' );
$draw = new GmagickDraw();
$draw ->setFillColor( 'white' );
$draw ->rectangle(0, 0, 800, 400);
$draw ->setFillColor( 'yellow' );
$draw ->setfontsize(50);
$draw ->annotate(30, 100, 'GeeksforGeeks' );
$gmagick ->drawImage( $draw );
$gmagick ->separateimagechannel(Gmagick::CHANNEL_BLUE);
header( "Content-Type: image/png" );
echo $gmagick ->getImageBlob();
?>
|
Output:
Reference: https://www.php.net/manual/en/gmagick.separateimagechannel.php
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