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    Imagick::setImageBias

    (PECL imagick 2, PECL imagick 3)

    Imagick::setImageBias — Sets the image bias for any method that convolves an image

    警告

    此函数在 Imagick 3.4.4 中被 废弃，强烈建议不要应用此函数。

    说明

    public Imagick::setImageBias(float $bias): bool

    Sets the image bias for any method that convolves an image (e.g. Imagick::ConvolveImage()).

    参数

    bias

    返回值

    成功时返回 true。

    错误／异常

    错误时抛出 ImagickException。

    示例

    示例 #1 Imagick::setImageBias()

    <?php
    //requires ImageMagick version 6.9.0-1 to have an effect on convolveImage
    function setImageBias($bias) {
    $imagick = new \Imagick(realpath("images/stack.jpg"));

    $xKernel = array(
    -    0.70, 0, 0.70,
    -    0.70, 0, 0.70,
    -    0.70, 0, 0.70
    );

    $imagick->setImageBias($bias * \Imagick::getQuantum());
    $imagick->convolveImage($xKernel, \Imagick::CHANNEL_ALL);

    $imagick->setImageFormat('png');

    header('Content-type: image/png');
    echo     $imagick->getImageBlob();
    }

    ?>

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