PHP中实现图片的锐化


<?
  //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( PHP中实现图片的锐化 - 站长学院


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