(PECL imagick 2 >= 2.3.0, PECL imagick 3)
Imagick::functionImage — Applies a function on the image
$function
, array $arguments
, int $channel
= Imagick::CHANNEL_DEFAULT): boolApplies an arithmetic, relational, or logical expression to a pseudo image.
See also » ImageMagick v6 Examples - Image Transformations — Function, Multi-Argument Evaluate
Este método estará disponível se a extensão Imagick tiver sido compilada com a ImageMagick versão 6.4.9 ou superior.
function
Refer to this list of function constants
arguments
Array of arguments to pass to this function.
Retorna true
em caso de sucesso.
Lança uma exceção ImagickException em caso de erro.
Exemplo #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();
?>
O exemplo acima produzirá algo semelhante a:
Exemplo #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();
?>
O exemplo acima produzirá algo semelhante a:
Exemplo #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();
?>
O exemplo acima produzirá algo semelhante a: