Imagick::fxImage

(PECL imagick 2, PECL imagick 3)

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

Descrizione

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.

Elenco dei parametri

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.

Valori restituiti

Restituisce true in caso di successo.

Errori/Eccezioni

Lancia una ImagickException in caso di errore.

Esempi

Example #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();
}

?>

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User Contributed Notes 1 note

down

thomasgf22 at NOSPAM dot gmail dot com ¶

10 years ago

Beware that fxImage return value's type is a new object(Imagick), opposing the current documentation (boolean). Therefore it does not affect the caller object. Example:
<?php
            $canvas = new Imagick();
            $canvas->newImage(256, 256, "white", "jpg");

            $gradient = new Imagick();
            $gradient->newPseudoImage(256, 256, "gradient:white-black");
            $canvas->compositeImage( $gradient, imagick::COMPOSITE_OVER, 0, 0 );
            $canvas->rotateImage(new ImagickPixel(), 90);
            /*instead of just $canvas->fxImage("floor(s*10+0.5)/10"); we must store fxImage()'s result*/
            $canvas= $canvas->fxImage("floor(s*10+0.5)/10");

            header( "Content-Type: image/jpg" );
            echo $canvas; 
?>

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