Imagick::fxImage

(PECL imagick 2.0.0)

Imagick::fxImageEvaluate expression for each pixel in the image

Опис

Imagick Imagick::fxImage ( string $expression [, int $channel = Imagick::CHANNEL_ALL ] )

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

Параметри

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.

Значення, що повертаються

Повертає TRUE в разі успіху.

Помилки/Винятки

Кидає ImagickException в разі помилки.

Приклади

Приклад #1 Imagick::fxImage()

<?php
function fxImage() {
    
$imagick = new \Imagick();
    
$imagick->newPseudoImage(200200"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();
}

?>

add a note add a note

User Contributed Notes 1 note

up
4
thomasgf22 at NOSPAM dot gmail dot com
9 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;
?>
To Top