imageconvolution

PHP 5 >= 5.1.0, PHP 7, PHP 8
imageconvolution - Apply a 3x3 convolution matrix, using coefficient and offset
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Code Examples

imageconvolution( GdImage$image, array$matrix, float$divisor, float$offset ): bool

Applies a convolution matrix on the image, using the given coefficient and offset.

Parameters

image

A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.

matrix

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

divisor

The divisor of the result of the convolution, used for normalization.

offset

Color offset.

Return Values

Returns true on success or false on failure.

Changelog

Version Description
8.0.0 image expects a GdImage instance now; previously, a resource was expected.

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Function imageconvolution:

Image Processing and GD Functions

Most used PHP functions