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How to apply a 3×3 convolution matrix using imageconvolution() in PHP?
imageconvolution() is an inbuilt function in PHP that is used to apply a 3×3 convolution matrix, using the coefficient and offset in the image.
Syntax
bool imageconvolution ( $image, $matrix, $div, $offset)
Parameters
imageconvolution() takes four parameters: $image, $matrix, $div, and $offset.
$image − This parameter is used to create the size of the image by using an image creation function such as imagecreatetruecolor().
$matrix − This parameter contains an array of 3×3 matrix of floats.
$div − It is used for normalization.
$offset − This parameter is used to set the color offset.
Return Values
imageconvolution() returns True on success and False on failure.
Example 1
<?php // load the PNG image by using imagecreatefrompng function. $image = imagecreatefrompng('C:\xampp\htdocs\Images\img59.png'); // Applied the 3X3 array matrix $matrix = array( array(2, 0, 0), array(0, -1, 0), array(0, 0, -1) ); // imageconvolution function to modify image elements imageconvolution($image, $matrix, 1, 127); // show the output image in the browser header('Content-Type: image/png'); imagepng($image, null, 9); ?>
Output
Input PNG image before using imageconvolution() function
.png)
Output PNG image after using imageconvolution() function
.jpg)
Example 2
<?php $image = imagecreatetruecolor(700, 300); // Writes the text and apply a gaussian blur on the image imagestring($image, 50, 25, 8, 'Gaussian Blur Text image', 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, 15, 20, 18, 'Gaussian Blur Text image', 0x00ff00); header('Content-Type: image/png'); imagepng($image, null, 9); ?>
Output
.jpg)
Updated on: 09-Aug-2021
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