Imagick::functionImage

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

Imagick::functionImage — Applies a function on the image

说明

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

Applies an arithmetic, relational, or logical expression to a pseudo image.

此方法在Imagick基于ImageMagick 6.4.9以上版本编译时可用。

参数

function: Refer to this list of function constants
arguments: Array of arguments to pass to this function.

返回值

成功时返回 true。

错误／异常

错误时抛出 ImagickException。

示例

示例 #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();
?>

以上示例的输出类似于：

示例 #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();
?>

以上示例的输出类似于：

示例 #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();
?>

以上示例的输出类似于：