DJ Mike's Tutorials: PHP

ImageMagick Functions

Imagick::setImageVirtualPixelMethod

Description:

bool Imagick::setImageVirtualPixelMethod ( int $method )

Changes how the pixels that fall off the edges of an image are handled when it is distorted.

Parameters:

method

imagick::VIRTUALPIXELMETHOD_UNDEFINED

imagick::VIRTUALPIXELMETHOD_BACKGROUND

Virtual pixels are set to the image background color

imagick::VIRTUALPIXELMETHOD_CONSTANT

imagick::VIRTUALPIXELMETHOD_EDGE

Virtual pixels are set to the color of the nearest edge

imagick::VIRTUALPIXELMETHOD_MIRROR

Virtual pixels mirror the image

imagick::VIRTUALPIXELMETHOD_TILE

Virtual pixels are set to tile the image

imagick::VIRTUALPIXELMETHOD_TRANSPARENT

Virtual pixels are set to transparent for GIF's and PNG's, black for JPEG's

Return Values

Returns TRUE on success.

Example

Background

<?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("blue");
$image->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_BACKGROUND );
$image->distortImage( Imagick::DISTORTION_PERSPECTIVE, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Edge

<?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->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_EDGE );
$image->distortImage( Imagick::DISTORTION_PERSPECTIVE, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Mirror

<?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->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_MIRROR );
$image->distortImage( Imagick::DISTORTION_PERSPECTIVE, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Tile

<?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->setImageVirtualPixelMethod( Imagick::VIRTUALPIXELMETHOD_TILE );
$image->distortImage( Imagick::DISTORTION_PERSPECTIVE, $points, TRUE ); 
header( "Content-Type: image/jpeg" ); 
echo $image;
?>

Transparent

<?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->setImageVirtualPixelMethod( imagick::VIRTUALPIXELMETHOD_TRANSPARENT );
$image->distortImage( Imagick::DISTORTION_PERSPECTIVE, $points, TRUE ); 
header("Content-type: image/jpeg");
echo $image;
?>

^

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