Imagick::functionImage

Applies a function on the image

&reftitle.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.

See also ImageMagick v6 Examples - Image Transformations — Function, Multi-Argument Evaluate

&imagick.method.available.0x649;

&reftitle.parameters;

`function`

- Refer to this list of function constants

`arguments`

- Array of arguments to pass to this function.

&reftitle.returnvalues;

&imagick.return.success;

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&imagick.imagick.throws;

&reftitle.examples;

### 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();
    ?>

&example.outputs.similar; Output of create a sinusoidal gradient

### 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();
    ?>

&example.outputs.similar; Output of create a polynomial gradient

### 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();
    ?>

&example.outputs.similar; Output of create complex gradient