imageconvolution
(PHP 5 >= 5.1.0RC1)
imageconvolution -- Apply a 3x3 convolution matrix, using coefficient and offset
Beskrivelse
bool
imageconvolution ( resource image, array matrix, float div, float offset )
Applies a convolution matrix on the image, using the given coefficient and
offset.
Parameterliste
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
Returneringsværdier
Returnerer TRUE ved succes, FALSE ved fejl.
Eksempler
Eksempel 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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Ovenstående eksempel vil udskrive: 
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Eksempel 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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Ovenstående eksempel vil udskrive: 
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Notes
Bemærk: Denne funktion er kun tilgængelig hvis
PHP er kompileret med den medfølgende version af GD biblioteket.