Imagick::functionImage
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Imagick::functionImage — Applies a function on the image
Description
public bool Imagick::functionImage ( int $function , array $arguments [, int $channel = Imagick::CHANNEL_DEFAULT ] )Applies an arithmetic, relational, or logical expression to a pseudo image.
This method is available if Imagick has been compiled against ImageMagick version 6.4.9 or newer.
Parameters
function
Refer to this list of function constants
arguments
Array of arguments to pass to this function.
Return Values
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.
Examples
Example #1 Create a sinusoidal gradient
<?php
$imagick = new Imagick();
$imagick->newPseudoImage(200, 200, 'gradient:black-white');
$arguments = array(3, -90);
$imagick->functionImage(Imagick::FUNCTION_SINUSOID, $arguments);
header("Content-Type: image/png");
$imagick->setImageFormat("png");
echo $imagick->getImageBlob();
?>The above example will output something similar to:
Example #2 Create a gradient from the polynomial (4x^2 - 4x + 1)
<?php
$imagick = new Imagick();
$imagick->newPseudoImage(200, 200, 'gradient:black-white');
$arguments = array(4, -4, 1);
$imagick->functionImage(Imagick::FUNCTION_POLYNOMIAL, $arguments);
header("Content-Type: image/png");
$imagick->setimageformat("png");
echo $imagick->getImageBlob();
?>The above example will output something similar to:
Example #3 Create a complex gradient from the polynomial (4x^2 - 4x^2 + 1) modulated by a sinusoidal gradient
<?php
$imagick1 = new Imagick();
$imagick1->newPseudoImage(200, 200, 'gradient:black-white');
$arguments = array(9, -90);
$imagick1->functionImage(Imagick::FUNCTION_SINUSOID, $arguments);
$imagick2 = new Imagick();
$imagick2->newPseudoImage(200, 200, 'gradient:black-white');
$arguments = array(0.5, 0);
$imagick2->functionImage(Imagick::FUNCTION_SINUSOID, $arguments);
$imagick1->compositeimage($imagick2, Imagick::COMPOSITE_MULTIPLY, 0, 0);
header("Content-Type: image/png");
$imagick1->setImageFormat("png");
echo $imagick1->getImageBlob();
?>The above example will output something similar to:
← Imagick::frameImage
Imagick::fxImage →
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