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Imagick::fxImage

(PECL imagick 2, PECL imagick 3)

Imagick::fxImageEvaluate 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 [http://www.imagemagick.org/script/fx.php » 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

Example #1 Imagick::fxImage()

<?phpfunction 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();}?>