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imageconvolution

Description

The imageconvolution of Image for PHP apply a 3x3 convolution matrix, using coefficient and offset.

Syntax

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

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

Returns true on success or false on failure.

Examples

1 · return

<?

$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$matrix = array(
    array(1, 2, 1),
    array(2, 4, 2),
    array(1, 2, 1)
);
$divisor = 16;
$offset = 0;

$return = imageconvolution($image, $matrix, $divisor, $offset);

var_export($return);
true

2 · base64

<?

$width = 100;
$height = 100;
$image = imagecreatetruecolor($width, $height);

$red = 255;
$green = 255;
$blue = 255;
$color = imagecolorallocate($image, $red, $green, $blue);

$font = 1;
$x = 0;
$y = 0;
$string = "string";
imagestring($image, $font, $x, $y, $string, $color);

$matrix = array(
    array(1, 2, 1),
    array(2, 4, 2),
    array(1, 2, 1)
);
$divisor = 16;
$offset = 0;
imageconvolution($image, $matrix, $divisor, $offset);

ob_start();

    imagepng($image);

$output = ob_get_clean();

echo '<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,' . base64_encode($output) . '">
</body>
</html>';
<!doctype html>
<html>
<body>
    <img src="data:image/png;base64,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">
</body>
</html>
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