Imagick::fxImage

(PECL imagick 2, PECL imagick 3)

Imagick::fxImage — Evaluate expression for each pixel in the image

说明

public Imagick::fxImage ( string $expression , int $channel = Imagick::CHANNEL_DEFAULT ) : Imagick

Evaluate expression for each pixel in the image. Consult » The Fx Special Effects Image Operator for more information.

参数

expression: The expression.
channel: Provide any channel constant that is valid for your channel mode. To apply to more than one channel, combine channeltype constants using bitwise operators. Refer to this list of channel constants.

返回值

成功时返回 true。

错误／异常

错误时抛出 ImagickException。

范例

示例 #1 Imagick::fxImage()


<?php
function fxImage() {
    $imagick = new \Imagick();
    $imagick->newPseudoImage(200, 200, "xc:white");

    $fx = 'xx=i-w/2; yy=j-h/2; rr=hypot(xx,yy); (.5-rr/140)*1.2+.5';
    $fxImage = $imagick->fxImage($fx);

    header("Content-Type: image/png");
    $fxImage->setimageformat('png');
    echo $fxImage->getImageBlob();
}

?>