Imagick::fxImage

    (PECL imagick 2, PECL imagick 3)

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

    Description

    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.

    Parameters

    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.

    Return Values

    Returns true on success.

    Errors/Exceptions

    Throws ImagickException on error.

    Examples

    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();
    }

    ?>

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 1 note

    up
    4
    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;
    ?>
    ＋add a note
    To Top