//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; $x
for ($y=1; $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:$b
;
if (($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]))
{　
set_time_limit(10*60);
if (($imagetype=getimagetype($_post[imagename]))==false)
die(指定文件不存在或不是有效的图片或不支持类型！);
if ($imagetype==6) $imagetype = 0;
if ($imagetype>3) die(不支持的图片类型！);
$im1 = $imagefunctions[$imagetype]($_post[imagename]);
$im2 = $imagefunctions[$imagetype]($_post[imagename]);
//print_r(imagecolorsforindex($im, imagecolorat($im, 10, 10)));
sharp($im1, $im2, $_post[degree]);
header(content-type: image/png);
imagepng($im2);
imagedestroy($im1);
imagedestroy($im2);
}　
?>
请输入图片的本地路径或url:
锐化度数（例：0.6、3.0）:
改了一下，省了一个$im： 　
function sharp2(&$im, $degree)
{
$cnt = 0;
for ($x=imagesx($im)-1; $x>0; $x--)
for ($y=imagesy($im)-1; $y>0; $y--)
{
$clr1 = imagecolorsforindex($im, imagecolorat($im, $x-1, $y-1));
$clr2 = imagecolorsforindex($im, imagecolorat($im, $x, $y));
$r = intval($clr2[red]+$degree*($clr2[red]-$clr1[red]));
$g = intval($clr2[green]+$degree*($clr2[green]-$clr1[green]));
$b = intval($clr2[blue]+$degree*($clr2[blue]-$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:$b
;
if (($new_clr=imagecolorexact($im, $r, $g, $b))==-1)
$new_clr = imagecolorallocate($im, $r, $g, $b);
$cnt++;
if ($new_clr==-1) die(color allocate faile at $x, $y ($cnt).);
imagesetpixel($im, $x, $y, $new_clr);
}
}
http://www.bkjia.com/phpjc/314463.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/314463.htmltecharticle? //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,...