PHP中实现图片的锐化

没错，PHP也可以实现图片的锐化、模糊、浮雕等操作。因为PHP作为网页脚本特长不在此，但在对效率要求不高、又不想使用CGI的情况下，让我们来看看该怎样做。

下面内容已经被收录在CSDN中PHP的FAQ里：http://community.csdn.net/Expert/FAQ/FAQ_Index.asp?id=188506

<?

//读取图像的类型

//1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order), 8 = TIFF(motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF

function GetImageType($filename) {return (($imginfo=@getimagesize($filename))!=null ? $imginfo[2] : null);}

//图像锐化

//$scr_im:图像资源句柄，$degree:锐化度数

function Sharp(&$src_im, &$dst_im, $degree)

{

$src_x = imagesx($src_im);

$src_y = imagesy($src_im);

//$dst_im = imagecreate($src_x, $src_y);

//imagecopy($dst_im, $src_im, 0, 0, 0, 0, $src_x, $src_y);

$cnt = 0;

for ($x=1; $x<$src_x; $x++)

for ($y=1; $y<$src_y; $y++)

{

$src_clr1 = imagecolorsforindex($src_im, imagecolorat($src_im, $x-1, $y-1));

$src_clr2 = imagecolorsforindex($src_im, imagecolorat($src_im, $x, $y));

$r = intval($src_clr2["red"]+$degree*($src_clr2["red"]-$src_clr1["red"]));

$g = intval($src_clr2["green"]+$degree*($src_clr2["green"]-$src_clr1["green"]));

$b = intval($src_clr2["blue"]+$degree*($src_clr2["blue"]-$src_clr1["blue"]));

$r = min(255, max($r, 0));

$g = min(255, max($g, 0));

$b = min(255, max($b, 0));

//echo "r:$r, g:$g, b:$b<br/>";

if (($dst_clr=imagecolorexact($dst_im, $r, $g, $b))==-1)

$dst_clr = Imagecolorallocate($dst_im, $r, $g, $b);

$cnt++;

if ($dst_clr==-1) die("color allocate faile at $x, $y ($cnt).");

imagesetpixel($dst_im, $x, $y, $dst_clr);

}

return $dst_im;

}

$ImageFunctions = array("imagecreatefromwbmp", "imagecreatefromgif", "imagecreatefromjpeg", "imagecreatefrompng");

if (!empty($_POST["ImageName"]))

{