- A+
所属分类:PHP编程
- <?
- //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);
- }
- }