note 63816 added to function.imageconvolution
| From: | interghost at crovortex dot com | Date: | Fri, 31 Mar 2006 19:26:31 +0000 |
| Subject: | note 63816 added to function.imageconvolution | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-107097@lists.php.net to get a copy of this message | ||
an implementation of this function for PHP versions <5.1
<?php
if(!function_exists("imageconvolution"))
{
function imageconvolution(&$img,$mat,$div,$off)
{
if(!imageistruecolor($img) || !is_array($mat) || count($mat)!=3 || count($mat[0])!=3 ||
count($mat[1])!=3 || count($mat[2])!=3) return FALSE;
unset($bojainfo);
for($nx=0;$nx<imagesx($img)-1;$nx++)
{
for($ny=0;$ny<imagesy($img)-1;$ny++)
{
$rgb=imagecolorat($img,$nx,$ny);
$bojainfo[$nx][$ny][r]=($rgb>>16)&0xFF;
$bojainfo[$nx][$ny][g]=($rgb>>8)&0xFF;
$bojainfo[$nx][$ny][b]=$rgb&0xFF;
}
}
for($nx=1;$nx<imagesx($img)-1;$nx++)
{
for($ny=1;$ny<imagesy($img)-1;$ny++)
{
$nr=$mat[0][0]*$bojainfo[$nx-1][$ny-1][r] + $mat[0][1]*$bojainfo[$nx][$ny-1][r] +
$mat[0][2]*$bojainfo[$nx+1][$ny-1][r] + $mat[1][0]*$bojainfo[$nx-1][$ny][r] +
$mat[1][1]*$bojainfo[$nx][$ny][r] + $mat[1][2]*$bojainfo[$nx+1][$ny][r] +
$mat[2][0]*$bojainfo[$nx-1][$ny+1][r] + $mat[2][1]*$bojainfo[$nx][$ny+1][r] +
$mat[2][2]*$bojainfo[$nx+1][$ny+1][r];
$nr=intval(round($nr/$div));
if($nr<0) $nr=0;
elseif($nr>255) $nr=255;
$ng=$mat[0][0]*$bojainfo[$nx-1][$ny-1][g] + $mat[0][1]*$bojainfo[$nx][$ny-1][g] +
$mat[0][2]*$bojainfo[$nx+1][$ny-1][g] + $mat[1][0]*$bojainfo[$nx-1][$ny][g] +
$mat[1][1]*$bojainfo[$nx][$ny][g] + $mat[1][2]*$bojainfo[$nx+1][$ny][g] +
$mat[2][0]*$bojainfo[$nx-1][$ny+1][g] + $mat[2][1]*$bojainfo[$nx][$ny+1][g] +
$mat[2][2]*$bojainfo[$nx+1][$ny+1][g];
$ng=intval(round($ng/$div));
if($ng<0) $ng=0;
elseif($ng>255) $ng=255;
$nb=$mat[0][0]*$bojainfo[$nx-1][$ny-1][b] + $mat[0][1]*$bojainfo[$nx][$ny-1][b] +
$mat[0][2]*$bojainfo[$nx+1][$ny-1][b] + $mat[1][0]*$bojainfo[$nx-1][$ny][b] +
$mat[1][1]*$bojainfo[$nx][$ny][b] + $mat[1][2]*$bojainfo[$nx+1][$ny][b] +
$mat[2][0]*$bojainfo[$nx-1][$ny+1][b] + $mat[2][1]*$bojainfo[$nx][$ny+1][b] +
$mat[2][2]*$bojainfo[$nx+1][$ny+1][b];
$nb=intval(round($nb/$div));
if($nb<0) $nb=0;
elseif($nb>255) $nb=255;
$nrgb=($nr<<16)+($ng<<8)+$nb;
if(!imagesetpixel($img,$nx,$ny,$nrgb)) return FALSE;
}
}
return TRUE;
}
}
?>
it's a bit slowish so I wouldn't recommend big images, also offset is not implemented
(don't know what it's suppose to do)
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----
Manual Page -- http://www.php.net/manual/en/function.imageconvolution.php
Edit -- http://master.php.net/note/edit/63816
Del: integrated -- http://master.php.net/note/delete/63816/integrated
Del: useless -- http://master.php.net/note/delete/63816/useless
Del: bad code -- http://master.php.net/note/delete/63816/bad+code
Del: spam -- http://master.php.net/note/delete/63816/spam
Del: non-english -- http://master.php.net/note/delete/63816/non-english
Del: in docs -- http://master.php.net/note/delete/63816/in+docs
Del: other reasons-- http://master.php.net/note/delete/63816
Reject -- http://master.php.net/note/reject/63816
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