php模糊图片 函数

<?phpfunction 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