imageconvolution
(PHP 5 >= 5.1.0RC1)
imageconvolution -- Apply a 3x3 convolution matrix, using coefficient and offset
Descrição
bool
imageconvolution ( resource image, array matrix, float div, float offset )
Applies a convolution matrix on the image, using the given coefficient and
offset.
Parâmetros
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
Valores de retornado
Retorna TRUE em caso de sucesso ou FALSE em falhas.
Exemplos
Exemplo 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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O exemplo acima irá imprimir: 
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Exemplo 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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O exemplo acima irá imprimir: 
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Notas
Nota: Esta função somente está disponível se
o PHP estiver compilado com a versão embarcada da biblioteca GD.