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.
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: