PHP | Imagick functionImage() Function

The Imagick::functionImage() function is an inbuilt function in PHP which is used to apply an arithmetic, relational, or logical expression to a pseudo image.

Syntax:

bool Imagick::functionImage( int $function, array $arguments,
                     int $channel = Imagick::CHANNEL_DEFAULT )

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

• $function: This parameter holds the function to be applied.
• $arguments: This parameter holds the array to be passed to the function.
• $channel: This parameter holds the Imagick channel constants that provide any channel constant which is valid for channel mode. More than one channel can be combined using bitwise operators. The default value of channel constant is CHANNEL_DEFAULT.

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.

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

Program 1:

<?php

// Create a new Imagick object
$imagick = new Imagick();

// Create the pseudo image
$imagick->newPseudoImage(800, 200, 'gradient:green-white');

// Apply the functionImage() functions
$imagick->functionImage(Imagick::FUNCTION_SINUSOID, array(1, -90));

header("Content-Type: image/png");

// Display the output image
$imagick->setImageFormat("png");
echo $imagick->getImageBlob();

?>

Output:

Program 2:

<?php

// Create a new Imagick object
$imagick = new Imagick();

// Create the pseudo image
$imagick->newPseudoImage(800, 200, 'gradient:yellow-blue');

// Apply the functionImage() functions
$imagick->functionImage(Imagick::FUNCTION_POLYNOMIAL, array(6, -3, 1));

header("Content-Type: image/png");

// Display the output image
$imagick->setImageFormat("png");
echo $imagick->getImageBlob();

?>

Output:

Program 3:

<?php

// Create a new Imagick object
$imagick = new Imagick();

// Create the pseudo image
$imagick->newPseudoImage(800, 200, 'gradient:white-blue');

// Apply the functionImage() functions
$imagick->functionImage(Imagick::FUNCTION_SINUSOID, array(3, -90));

header("Content-Type: image/png");

// Display the output image
$imagick->setImageFormat("png");
echo $imagick->getImageBlob();

?>

Output:

Reference: https://www.php.net/manual/en/imagick.functionimage.php