imageconvolution
(PHP 5 >= 5.1.0RC1)
imageconvolution -- Apply a 3x3 convolution matrix, using coefficient and offset
Description
bool
imageconvolution ( resource image, array matrix, float div, float offset )
Applies a convolution matrix on the image, using the given coefficient and
offset.
Parameters
image
An image resource, returned by one of the image creation functions,
such as imagecreatetruecolor().
matrix
A 3x3 matrix: an array of three arrays of three floats.
div
The divisor of the result of the convolution, used for normalization.
offset
Return Values
Geeft TRUE terug bij succes, FALSE indien er een fout is opgetreden.
Voorbeelden
Voorbeeld 1. Embossing the PHP.net logo
<?php $image = imagecreatefromgif('http://www.php.net/images/php.gif');
$emboss = array(array(2, 0, 0), array(0, -1, 0), array(0, 0, -1)); imageconvolution($image, $emboss, 1, 127);
header('Content-Type: image/png'); imagepng($image, null, 9); ?>
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Het resultaat van dit script is als volgt: 
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Voorbeeld 2. Gaussian blur
<?php $image = imagecreatetruecolor(180,40);
// Writes the text and apply a gaussian blur on the image imagestring($image, 5, 10, 8, 'Gaussian Blur Text', 0x00ff00); $gaussian = array(array(1.0, 2.0, 1.0), array(2.0, 4.0, 2.0), array(1.0, 2.0, 1.0)); imageconvolution($image, $gaussian, 16, 0);
// Rewrites the text for comparison imagestring($image, 5, 10, 18, 'Gaussian Blur Text', 0x00ff00);
header('Content-Type: image/png'); imagepng($image, null, 9); ?>
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Het resultaat van dit script is als volgt: 
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Notes
Opmerking: This function is only available if
PHP is compiled with the bundled version of the GD library.