PHP | Imagick getImageChannelRange() Function

0 0 1 minute read

The Imagick::getImageChannelRange() function is an inbuilt function in PHP which is used to gets the range of channel.

Syntax:

array Imagick ::getImageChannelRange( $channel )

Parameters: This function accept single parameter $channel which specifies the channel to find image channel range. The default value of channel is Imagick::CHANNEL_DEFAULT.

Return Value: This function returns an array containing the minima and maxima of the required channel.

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

Program 1:
Original Image:

<?php 
  
// Create new Imagick object 
$im = new Imagick( 
'https://media.zambiatek.com/wp-content/uploads/zambiatek-15.png'); 
  
// Using getImageChannelRange function 
// with red channel 
$res = $im->getImageChannelRange(imagick::CHANNEL_RED); 
  
// Display result 
print_r($res); 
?> 

Output:

Array ( [minima] => 0 [maxima] => 65535 )

Program 2:
Original Image:

<?php  
  
$string = "Computer Science portal for Geeks!";  
  
// Creating new image of above String  
// and add color 
$im = new Imagick();  
$draw = new ImagickDraw();  
  
// Fill the color in image  
$draw->setFillColor(new ImagickPixel('green'));  
  
// Set the text font size  
$draw->setFontSize(50);  
  
$metrix = $im->queryFontMetrics($draw, $string);  
$draw->annotation(0, 40, $string);  
$im->newImage($metrix['textWidth'], $metrix['textHeight'],  
        new ImagickPixel('white'));  
// Draw the image          
$im->drawImage($draw);  
$im->setImageFormat('jpeg');  
  
// Using getImageChannelRange function 
// with red channel 
$res = $im->getImageChannelRange(imagick::CHANNEL_GREEN); 
  
// Display result 
print_r($res); 
?> 

Output:

Array ( [minima] => 32896 [maxima] => 65535 )

Reference: http://php.net/manual/en/imagick.getimagechannelrange.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!