PHP | Gmagick equalizeimage() Function

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://media.geeksforgeeks.org/wp-content/uploads/tech.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