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  • Imagick::functionImage()

    (No version information available, might only be in Git)

    Applies a function on the image

    说明

    publicImagick::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

    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。

    范例

    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();
    ?>
    

    以上例程的输出类似于:

    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();
    ?>
    

    以上例程的输出类似于:

    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();
    ?>
    

    以上例程的输出类似于: