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($_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);

  } 

  ?>

  <form name="FormName" action="" method="post">

  请输入图片的本地路径或URL:<br/>

  <input name="ImageName" type="text" value="<?=$_POST["ImageName"]?>" size=32><br/>

  锐化度数(例:0.6、3.0):<br/>

  <input name="Degree" type="text" value="<?=$_POST["Degree"]?>"><br/>

  <input type="submit" value="提交">

  </form> 

   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<br>";

   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);

   }

  }   

分类:php基础 时间:2015-01-03 人气:4
分享到:

相关文章

iOS 开发

Android 开发

Python 开发

JAVA 开发

开发语言

PHP 开发

Ruby 开发

搜索

前端开发

数据库

开发工具

开放平台

Javascript 开发

.NET 开发

云计算

服务器

Copyright (C) codeweblog.com, All Rights Reserved.

CodeWeblog.com 版权所有 闽ICP备15018612号

processed in 0.070 (s). 12 q(s)