PHP | imageconvolution() Function (original) (raw)

Last Updated : 11 Jul, 2025

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,image, image,matrix, div,div, 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:

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Output: Program 2:

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Output: Related Articles:

• PHP | imagecolorset() Function
• PHP | imagecolorat() function
• PHP | imagecolorsforindex() Function

Reference: https://www.php.net/manual/en/function.imageconvolution.php