imageconvolution
(PHP 5 >= 5.1.0)
imageconvolution — Apply a 3x3 convolution matrix, using coefficient and offset
Popis
bool imageconvolution
( resource $image
, array $matrix
, float $div
, float $offset
)
Applies a convolution matrix on the image, using the given coefficient and offset.
Parametre
- 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
-
Vrátené hodnoty
Vracia TRUE pri úspechu alebe FALSE pri chybe.
Príklady
Example#1 Embossing the PHP.net logo
<?php
$image = imagecreatefromgif('https://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);
?>
Výstup horeuvedeného príkladu bude:
Example#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);
?>
Výstup horeuvedeného príkladu bude:
Poznámky
Note: Táto funkcia je dostupná len ak bolo PHP kompilované s pribalenou verziou GD knižnice.