International PHP Conference 2015

imageconvolution

(PHP 5 >= 5.1.0, PHP 7)

imageconvolutionApply 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

Color offset.

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha.

Exemplos

Exemplo #1 Embossing the PHP.net logo

<?php
$image 
imagecreatefromgif('http://www.php.net/images/php.gif');

$emboss = array(array(200), array(0, -10), array(00, -1));
imageconvolution($image$emboss1127);

header('Content-Type: image/png');
imagepng($imagenull9);
?>

O exemplo acima irá imprimir:

Output of example : Embossing the PHP.net logo

Exemplo #2 Gaussian blur

<?php
$image 
imagecreatetruecolor(180,40);

// Writes the text and apply a gaussian blur on the image
imagestring($image5108'Gaussian Blur Text'0x00ff00);
$gaussian = array(array(1.02.01.0), array(2.04.02.0), array(1.02.01.0));
imageconvolution($image$gaussian160);

// Rewrites the text for comparison
imagestring($image51018'Gaussian Blur Text'0x00ff00);

header('Content-Type: image/png');
imagepng($imagenull9);
?>

O exemplo acima irá imprimir:

Output of example : Gaussian blur

Notas

Nota: Esta função somente está disponível se o PHP estiver compilado com a versão embarcada da biblioteca GD.

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