Imagick::setImageBias()

(PECL imagick 2.0.0)

Sets the image bias for any method that convolves an image

说明

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。

范例

Example #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();
}
?>