PHP imageconvolution Function: Using div and offset to Create a 3×3 Convolution Matrix
The PHP imageconvolution function applies a 3×3 convolution matrix to an image resource, allowing specification of a divisor and offset for normalization and color adjustment, with detailed parameter descriptions, return values, and a complete example code snippet.
The imageconvolution function in PHP applies a 3×3 convolution matrix to an image resource, allowing you to specify a divisor and an offset for normalization and color adjustment.
Parameters
image – an image resource created by functions such as imagecreatetruecolor().
matrix – a 3×3 array of floating‑point numbers (array of arrays).
div – the divisor applied to the convolution result for scaling.
offset – a color offset added after convolution.
Return value
Returns TRUE on success or FALSE on failure.
Example
<?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);
?>Signed-in readers can open the original source through BestHub's protected redirect.
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