imageconvolution
(PHP 5 >= 5.1.0, PHP 7)
imageconvolution — 锟斤拷系锟斤拷 div 锟斤拷 offset 锟斤拷锟斤拷一锟斤拷 3x3 锟侥撅拷锟斤拷锟斤拷锟�
说锟斤拷
imageconvolution
( resource
$image
, array $matrix
, float $div
, float $offset
) : boolApplies a convolution matrix on the image, using the given coefficient and offset.
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-
image -
锟斤拷图锟襟创斤拷锟斤拷锟斤拷(锟斤拷锟斤拷imagecreatetruecolor())锟斤拷锟截碉拷图锟斤拷锟斤拷源锟斤拷
-
matrix -
A 3x3 matrix: an array of three arrays of three floats.
-
div -
The divisor of the result of the convolution, used for normalization.
-
offset -
Color offset.
锟斤拷锟斤拷值
锟缴癸拷时锟斤拷锟斤拷 TRUE锟斤拷 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE锟斤拷
锟斤拷锟斤拷
Example #1 Embossing the PHP.net logo
<?php
$image = imagecreatefromgif('http://www.php.net/images/php.gif');
$emboss = array(array(2, 0, 0), array(0, -1, 0), array(0, 0, -1));
imageconvolution($image, $emboss, 1, 127);
header('Content-Type: image/png');
imagepng($image, null, 9);
?>
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Example #2 Gaussian blur
<?php
$image = imagecreatetruecolor(180,40);
// Writes the text and apply a gaussian blur on the image
imagestring($image, 5, 10, 8, 'Gaussian Blur Text', 0x00ff00);
$gaussian = array(array(1.0, 2.0, 1.0), array(2.0, 4.0, 2.0), array(1.0, 2.0, 1.0));
imageconvolution($image, $gaussian, 16, 0);
// Rewrites the text for comparison
imagestring($image, 5, 10, 18, 'Gaussian Blur Text', 0x00ff00);
header('Content-Type: image/png');
imagepng($image, null, 9);
?>
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注锟斤拷
Note: 锟剿猴拷锟斤拷锟斤拷锟斤拷锟斤拷 GD 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 PHP 锟芥本锟叫匡拷锟矫★拷