PHP | Gmagick separateimagechannel() Function

0 0 1 minute read

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 
  
// Create a new Gmagick object 
$gmagick = new Gmagick('zambiatek.png'); 
  
// Separate the Gmagick::CHANNEL_RED 
$gmagick->separateimagechannel(Gmagick::CHANNEL_RED); 
  
// Display the image 
header("Content-Type: image/png"); 
echo $gmagick; 
?> 

Output:

Program 2 (Separating the Green channel):

<?php 
  
// Create a new Gmagick object 
$gmagick = new Gmagick('zambiatek.png'); 
  
// Separate the Gmagick::CHANNEL_GREEN 
$gmagick->separateimagechannel(Gmagick::CHANNEL_GREEN); 
  
// Display the image 
header("Content-Type: image/png"); 
echo $gmagick; 
?> 

Output:

Program 3 (For a drawing):

<?php 
  
// Create a new Gmagick object 
$gmagick = new Gmagick('zambiatek.png'); 
  
// Create a GmagickDraw object 
$draw = new GmagickDraw(); 
  
// Set the color 
$draw->setFillColor('white'); 
  
// Function to draw rectangle 
$draw->rectangle(0, 0, 800, 400); 
  
// Set the fill color 
$draw->setFillColor('yellow'); 
  
// Set the font size 
$draw->setfontsize(50); 
  
// Annotate a text 
$draw->annotate(30, 100, 'zambiatek'); 
  
// Use of drawimage function 
$gmagick->drawImage($draw); 
  
// Separate the Gmagick::CHANNEL_BLUE 
$gmagick->separateimagechannel(Gmagick::CHANNEL_BLUE); 
  
// Display the output image 
header("Content-Type: image/png"); 
echo $gmagick->getImageBlob(); 
?> 

Output:

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

Whether you’re preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, zambiatek Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we’ve already empowered, and we’re here to do the same for you. Don’t miss out – check it out now!