imageconvolution() function in PHP

The imageconvolution() function

Syntax

bool imageconvolution (img, matrix, div, offset )

Parameters

• img: Create image with imagecreatetruecolor() function.

• matrix: A 3x3 matrix is an array of three arrays of three floats.

• div: Divisor of the result of the convolution, used for normalization.

• offset: The color offset.

Return

The imageconvolution() function returns True on success or False on failure.

Example

The following is an example

<?php
   $img = imagecreatefromgif('https://www.tutorialspoint.com/images/html.gif');
   $arr = array(array(2, 0, 1), array(-1, -1, 0), array(0, 0, -1));
   imageconvolution($img, $arr, 1, 127);
   header('Content-Type: image/png');
   imagepng($img, null, 9);
?>

Output

The following is the output

Example

Let us see another example with different parameter values for the same image. You can easily spot the difference now:

<?php
   $img = imagecreatefromgif('https://www.tutorialspoint.com/images/html.gif');
   $arr = array(array(3, 2, 1), array(0, 1, 0), array(1, -1, -1));
   imageconvolution($img, $arr, 3, 110);
   header('Content-Type: image/png');
   imagepng($img, null, 9);
?>

Output

The following is the output