php模糊图片 函数

<?php

function blurImage($srcimg,$blur)
{
$blur = $blur*$blur;
$blur = max(0,min(1,$blur));

$srcw = imagesx($srcimg);
$srch = imagesy($srcimg);

$dstimg = imagecreatetruecolor($srcw,$srch);

$f1a = $blur;
$f1b = 1.0 - $blur;

$cr = 0; $cg = 0; $cb = 0;
$nr = 0; $ng = 0; $nb = 0;

$rgb = imagecolorat($srcimg,0,0);
$or = ($rgb >> 16) & 0xFF;
$og = ($rgb >> 8) & 0xFF;
$ob = ($rgb) & 0xFF;

//-------------------------------------------------
// first line is a special case
//-------------------------------------------------
$x = $srcw;
$y = $srch-1;
while ($x--)
{
//horizontal blurren
$rgb = imagecolorat($srcimg,$x,$y);
$cr = ($rgb >> 16) & 0xFF;
$cg = ($rgb >> 8) & 0xFF;
$cb = ($rgb) & 0xFF;

$nr = ($cr * $f1a) + ($or * $f1b);
$ng = ($cg * $f1a) + ($og * $f1b);
$nb = ($cb * $f1a) + ($ob * $f1b);

$or = $nr;
$og = $ng;
$ob = $nb;

imagesetpixel($dstimg,$x,$y,($nr << 16) | ($ng << 8) | ($nb));
}
//-------------------------------------------------

//-------------------------------------------------
// now process the entire picture
//-------------------------------------------------
$y = $srch-1;
while ($y--)
{

$rgb = imagecolorat($srcimg,0,$y);
$or = ($rgb >> 16) & 0xFF;
$og = ($rgb >> 8) & 0xFF;
$ob = ($rgb) & 0xFF;

$x = $srcw;
while ($x--)
{
//horizontal
$rgb = imagecolorat($srcimg,$x,$y);
$cr = ($rgb >> 16) & 0xFF;
$cg = ($rgb >> 8) & 0xFF;
$cb = ($rgb) & 0xFF;

$nr = ($cr * $f1a) + ($or * $f1b);
$ng = ($cg * $f1a) + ($og * $f1b);
$nb = ($cb * $f1a) + ($ob * $f1b);

$or = $nr;
$og = $ng;
$ob = $nb;

//vertical
$rgb = imagecolorat($dstimg,$x,$y+1);
$vr = ($rgb >> 16) & 0xFF;
$vg = ($rgb >> 8) & 0xFF;
$vb = ($rgb) & 0xFF;

$nr = ($nr * $f1a) + ($vr * $f1b);
$ng = ($ng * $f1a) + ($vg * $f1b);
$nb = ($nb * $f1a) + ($vb * $f1b);

$vr = $nr;
$vg = $ng;
$vb = $nb;

imagesetpixel($dstimg,$x,$y,($nr << 16) | ($ng << 8) | ($nb));
}

}
//-------------------------------------------------
return $dstimg;

}

$srcimg = imagecreatefromjpeg("test.jpg");
$dstimg = blurImage($srcimg,0.45);

header('Content-type: image/jpeg');
echo( imagejpeg($dstimg) );
exit();

?>
效果
原图

处理后