PHP | Gmagick equalizeimage() Function

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The Gmagick::equalizeimage() function is an inbuilt function in PHP which is used to equalizes the histogram of an image.
Syntax:

Gmagick Gmagick::equalizeimage( void )

Parameters: This function does not accepts any parameter.

Return Value: This function returns equalized Gmagick object.

Errors/Exceptions: This function throws GmagickException on error.

Below programs illustrate the Gmagick::equalizeimage() function in PHP:

Program 1:

Original Image:

PHP

<?php 
   
// Create a Gmagick object 
$gmagick = new Gmagick(
'https://zambiatek.com/wp-content/uploads/2023/10/tech-103.png'); 
 
// Equalize the image.
$gmagick->equalizeimage();
 
header('Content-type: image/png'); 
   
// Output the image 
echo $gmagick; 
?>

Output:

Program 2:

PHP

<?php 
    
// Create a GmagickDraw object 
$draw = new GmagickDraw(); 
   
// Create GmagickPixel object 
$strokeColor = new GmagickPixel('Red'); 
$fillColor = new GmagickPixel('Green'); 
   
// Set the color, opacity of image 
$draw->setStrokeOpacity(1); 
$draw->setStrokeColor('Red'); 
$draw->setFillColor('Green'); 
   
// Set the width and height of image 
$draw->setStrokeWidth(7); 
$draw->setFontSize(72); 
    
// Function to draw circle  
$draw->circle(250, 250, 100, 150); 
  
$gmagick = new Gmagick(); 
$gmagick->newImage(500, 500, 'White'); 
$gmagick->setImageFormat("png"); 
$gmagick->drawImage($draw); 
 
// Equalize the image
$gmagick->equalizeimage();
  
// Display the output image 
header("Content-Type: image/png"); 
echo $gmagick->getImageBlob(); 
?> 

Output:

Reference: http://php.net/manual/en/gmagick.equalizeimage.php

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