Imagick::distortImage

Affine<?php $image = new imagick( "opossum.jpg" ); $points = array(                 0,0, 25,25,                  100,0, 100,50                );$image->setimagebackgroundcolor("#fad888");$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );$image->distortImage(  Imagick::DISTORTION_AFFINE, $points, TRUE ); header( "Content-Type: image/jpeg" ); echo $image;?>Affine Projection<?php $image = new imagick( "opossum.jpg" ); $points = array( 0.9,0.3,                -0.2,0.7,                 20,15 );$image->setimagebackgroundcolor("#fad888");$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );$image->distortImage( Imagick::DISTORTION_AFFINEPROJECTION, $points, TRUE ); header( "Content-Type: image/jpeg" ); echo $image;?>Arc<?php $image = new imagick( "opossum.jpg" ); $draw = new imagickdraw(); $degrees = array( 180 );$image->setimagebackgroundcolor("#fad888");$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );$image->distortImage( Imagick::DISTORTION_ARC, $degrees, TRUE ); header( "Content-Type: image/jpeg" ); echo $image;?>Rotated Arc<?php $image = new imagick( "opossum.jpg" ); $draw = new imagickdraw(); $degrees = array( 180, 45, 100, 20 );$image->setimagebackgroundcolor("#fad888");$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );$image->distortImage( Imagick::DISTORTION_ARC, $degrees, TRUE ); header( "Content-Type: image/jpeg" ); echo $image;?>Bilinear<?php $image = new imagick( "opossum.jpg" ); $points = array(                 0,0, 25,25, # top left                  176,0, 126,0, # top right                0,135, 0,105, # bottom right                 176,135, 176,135 # bottum left                );$image->setimagebackgroundcolor("#fad888");$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );$image->distortImage( Imagick::DISTORTION_BILINEAR, $points, TRUE ); header( "Content-Type: image/jpeg" ); echo $image;?>Perspective<?php $image = new imagick( "opossum.jpg" ); $points = array(                 0,0, 25,25, # top left                  176,0, 126,0, # top right                0,135, 0,105, # bottom right                 176,135, 176,135 # bottum left                );$image->setimagebackgroundcolor("#fad888");$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );$image->distortImage( Imagick::DISTORTION_PERSPECTIVE, $points, TRUE ); header( "Content-Type: image/jpeg" ); echo $image;?>Scale Rotate Translate<?php $image = new imagick( "opossum.jpg" ); $points = array(                  1.5, # scale 150%                 150 # rotate               );$image->setimagebackgroundcolor("#fad888");$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );$image->distortImage( imagick::DISTORTION_SCALEROTATETRANSLATE, $points, TRUE ); header( "Content-Type: image/jpeg" ); echo $image;?>

It is worth nothing that details on distorts as well as arguments can be found at http://www.imagemagick.org/Usage/distorts/ - the PHP manual doesn't give much, if any, detail on arguments.

I found this very useful when I had to do a translated rotation on an image - i.e. rotating around a point in the image that was not square in the center. This can be achieved by using distortImage with Imagick::DISTORTION_SCALEROTATETRANSLATE like this:

<?php

$imagick = new Imagick('/path/to/image');
$args = array(
    20, # x point to rotate around
    20, # y point to rotate around
    1, # scaling factor - 1 means no scaling
    90, # angle to rotate
);

$imagick->setImageVirtualPixelMethod(Imagick::VIRTUALPIXELMETHOD_TRANSPARENT);
$imagick->distortImage(Imagick::DISTORTION_SCALEROTATETRANSLATE, $args, true);

?>

Note that this type of distort takes from 1 to 7 arguments, depending on what you want to do exactly - there is a lot of flexibility here.

Slide image with shadow using distortImage<?php$slideValue = 150;// Create new object $im = new Imagick("grnhrs.jpg");// Resize $im->thumbnailImage(500,400);// Set the image format to png $im->setImageFormat('png');//Clone the current object$shadow = $im->clone();//Set image background color to black (this is the color of the shadow)$shadow->setImageBackgroundColor( new ImagickPixel( 'black' ) );  //Create the shadow $shadow->shadowImage( 80, 10, 5, 5 );// Fill background area with transparent for image//VIRTUALPIXELMETHOD_TRANSPARENT$im->setImageVirtualPixelMethod(Imagick::VIRTUALPIXELMETHOD_ TRANSPARENT);// Activate matte $im->setImageMatte(true);//Control points for the distortion $controlPoints = array( 0, 0,                        $slideValue, 0,                                                0, $im->getImageHeight(),                        0, $im->getImageHeight(),                                                $im->getImageWidth(), 0,                        $im->getImageWidth(), 0,                                                $im->getImageWidth(), $im->getImageHeight(),                        $im->getImageWidth()-$slideValue, $im->getImageHeight());                        // Perform the distortion $im->distortImage(Imagick::DISTORTION_PERSPECTIVEPROJECTION, $controlPoints, true);// Perform the distortion in shadow image$shadow->distortImage(Imagick::DISTORTION_PERSPECTIVEPROJECTION, $controlPoints, true);// Imagick::shadowImage only creates the shadow.// That is why the original image is composited over it $shadow->compositeImage( $im, Imagick::COMPOSITE_OVER, 0, 0 );/* Ouput the image */header("Content-Type: image/png");echo $shadow;?>

Control Points for DISTORTION_PERSPECTIVE are pairs of x0, y0, x1, y1 coordinates, where x0/y0 is the original point and x1/y1 is the destination point, e.g. for a four point distortion:    <?php     $im = new imagick( $fn);     $w=$im->getImageWidth();    $h=$im->getImageHeight();    $im->setImageFormat('png');    $controlPoints = array(                    $tLx, $tLy, 0, 0,  // top left                    $tRx, $tRy, $w, 0, // top right                    $bRx, $bRy, $w, $h, // bottom right                    $bLx, $bLy, 0, $h // bottom left                );    /* Perform the distortion */    $im->distortImage(Imagick::DISTORTION_PERSPECTIVE, $controlPoints, false);    // Output the image    $output = $im->getimageblob();    $outputtype = $im->getFormat();    header("Content-type: $outputtype");    echo $output;         ?>