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PHP | Gmagick equalizeimage() Function
  • Last Updated : 24 Mar, 2021

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(
 
// 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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