PHP | imageconvolution() Function
The imageconvolution() function is an inbuilt function in PHP which is used to modify the image content. It applies a 3 x 3 convolution matrix in the image, using the given coefficient and offset. This function returns true on success or false on failure.
Syntax:
bool imageconvolution ( $image, $matrix, $div, $offset )
Parameters: This function accepts four parameter as mentioned above and described below:
- $image: It is returned by one of the image creation functions, such as imagecreatetruecolor(). It is used to create size of image.
- $matrix: It contains an array of 3 x 3 (3 x 3 matrix) of floats.
- $div: It is divisor of result of the convolution, used for normalization.
- $offset: It is used to set the color offset.
Return Value: This function returns True on success or False on failure.
Below programs illustrate the imageconvolution() function in PHP:
Program 1:
<?php
$image = imagecreatefromgif(
$matrix = array (
array (2, 0, 0),
array (0, -1, 0),
array (0, 0, -1)
);
imageconvolution( $image , $matrix , 1, 127);
header( 'Content-Type: image/png' );
imagepng( $image , null, 9);
?>
|
Output:
Program 2:
<?php
$image = imagecreatefrompng(
$emboss = array (
array (0, -1, 2),
array (2, 0, 0),
array (2, 0, -2)
);
imageconvolution( $image , $emboss , 1, 127);
header( 'Content-Type: image/png' );
imagepng( $image , null, 9);
?>
|
Output:
Related Articles:
Reference: http://php.net/manual/en/function.imageconvolution.php
Last Updated :
23 Aug, 2019
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