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Imagick::functionImage

(PECL imagick 2 >= 2.3.0, PECL imagick 3)

Imagick::functionImageApplies a function on the image

Descrição

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

Applies 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.

Parâmetros

function

Refer to this list of function constants

arguments

Array of arguments to pass to this function.

Valor Retornado

Retorna true em caso de sucesso.

Erros/Exceções

Lança uma exceção ImagickException em caso de erro.

Exemplos

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:

Output of create a sinusoidal gradient

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:

Output of create a polynomial gradient

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:

Output of create complex gradient

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