PHP | Gmagick modulateimage() Function

The Gmagick::modulateimage() function is an inbuilt function in PHP which is used to control the brightness, saturation, and hue of an image.

Syntax:

Gmagick Gmagick::modulateimage( $brightness, $saturation, $hue )

Parameters: This function accepts three parameters as mentioned above and described below:

• $brightness: This parameter is used to hold the value of brightness.
• $saturation: This parameter is used to hold the value of saturation.
• $hue: This parameter is used to hold the value of hue.

Return Value: This function returns Gmagick object on success.

Errors/Exceptions: This function throws GmagickException on error.

Below programs illustrates the Gmagick::modulateimage() function in PHP:

Program 1:
Input Image:

<?php

// Create a Gmagick object
$gmagick = new Gmagick(
'https://media.geeksforgeeks.org/wp-content/uploads/tech.png');

// Use modulateimage function
$gmagick->modulateimage(60, 100, 100);

header('Content-type: image/png');

// Output the image
echo $gmagick;
?>

Output:

Program 2:

<?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);


// Use modulateimage function
$gmagick->modulateimage(60, 100, 100);

// Display the output image
header("Content-Type: image/png");
echo $gmagick->getImageBlob();
?>

Output:

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