(C#)给图片加上水印效果
private void Btn_Upload_Click(object sender, System。EventArgs e)
        {
            if(UploadFile。PostedFile。
  FileName。Trim()!="")
            {
                //上传文件
                string extension = Path。GetExtension(UploadFile。
  PostedFile。FileName)。ToUpper();
                string fileName = DateTime。Now。Year。ToString() + DateTime。Now。Month。ToString() + DateTime。
  Now。Day。ToString() + DateTime。Now。Hour。ToString() + DateTime。Now。Minute。ToString() + DateTime。Now。Second。ToString();
                string path = Server。
  MapPath("。") + "/UploadFile/" + fileName + extension;
                UploadFile。PostedFile。SaveAs(path);
                //加文字水印，注意，这里的代码和以下加图片水印的代码不能共存
                System。
  Drawing。Image image = System。Drawing。Image。FromFile(path);
                Graphics g = Graphics。FromImage(image);
                g。
  DrawImage(image, 0, 0, image。Width, image。Height);
                Font f = new Font("Verdana", 32);
                Brush b = new SolidBrush(Color。
  White);
                string addText = AddText。Value。Trim();
                g。DrawString(addText, f, b, 10, 10);
                g。
  Dispose();
                //加图片水印
                System。Drawing。Image image = System。Drawing。Image。FromFile(path);
                System。
  Drawing。Image copyImage = System。Drawing。Image。FromFile( Server。MapPath("。") + "/ f");
                Graphics g = Graphics。
  FromImage(image);
                g。DrawImage(copyImage, new Rectangle(image。Width-copyImage。Width, image。Height-copyImage。
  Height, copyImage。Width, copyImage。Height), 0, 0, copyImage。Width, copyImage。Height, GraphicsUnit。Pixel);
                g。
  Dispose();
                //保存加水印过后的图片,删除原始图片
                string newPath = Server。MapPath("。") + "/UploadFile/" + fileName + "_new" + extension;
                image。
  Save(newPath);
                image。Dispose();
                if(File。Exists(path))
                {
                    File。
  Delete(path);
                }
                Response。Redirect(newPath);
            }
        }
-----------------------------------------------------
PHP给图片加上水印效果
limit = 500;//长宽限制 
$image->wm_text=" ";//水印文字 
$image->wm_fontfile="font/ f";//字体文件 
$image->wm_color="00cccc"; 
//$image->save_file = " g";//保存到xx文件 
$image->create(" g");//从xx文件创建 
/* 
+-------------------------------------------------------------------------- 
| 生成缩略图&加水印的图片类 
| ============================ 
| by Dash 
|   - 共享互联网 
| ============================ 
| 网址：  
| 邮件：Dash@  
+-------------------------------------------------------------------------- 
*/ 
Class Gimage{ 
var $input_type = ""; //输入图片的格式 
var $output_type = ""; //输出图片的格式 
var $limit = 0; //图片大小限制 
var $filename = ""; //输入图片的文件名(也可以直接是图片数据) 
var $jpeg_quality = 90; //jpeg图片质量 
var $save_file = ''; //输出文件名 
var $wm_text = ""; //水印文字( 不支持中文:'( ) 
var $wm_size = 50; //水印文字大小 
var $wm_angle = 0; //水印文字角度 
var $wm_x = 50; //水印x坐标 
var $wm_y = 50; //水印y坐标 
var $wm_color = "#cccccc"; //水印颜色 
var $wm_fontfile = " f";//水印字体文件 
function create($filename="") 
{ 
if ($filename) $this->filename = $filename; 
if (!$this->input_type) $this->get_type(); 
if (!$this->output_type) $this->output_type = $this->input_type; 
if ($this->input_type == "jpg") $this->input_type = "jpeg"; 
if ($this->output_type == "jpg") $this->output_type = "jpeg"; 
switch ($this->input_type){ 
case 'gif': 
  $src_img=ImageCreateFromGIF($this->filename); 
  break; 
case 'jpeg': 
  $src_img=ImageCreateFromJPEG($this->filename); 
  break; 
case 'png': 
  $src_img=ImageCreateFromPNG($this->filename); 
  break; 
default: 
  $src_img=ImageCreateFromString($this->filename); 
  break; 
} 
$src_w=ImageSX($src_img); 
$src_h=ImageSY($src_img); 
if ($src_w>=$src_h){ 
if ($src_w>$this->limit){ 
  $new_w=$this->limit; 
  $new_h=($this->limit / $src_w)*$src_h; 
} 
} 
else{ 
if ($src_h>$this->limit){ 
  $new_h=$this->limit; 
  $new_w=($this->limit / $src_h)*$src_w; 
} 
} 
if ($new_h){ 
$dst_img=imagecreatetruecolor($new_w,$new_h); 
imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_w,$new_h,ImageSX($src_img),ImageSY($src_img)); 
} 
else{ 
$dst_img = $src_img; 
} 
if ($this->wm_text) 
{ 
if(preg_match("/([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])/i", $this->wm_color, $color)) 
{ 
  $red = hexdec($color[1]); 
  $green = hexdec($color[2]); 
  $blue = hexdec($color[3]); 
} 
$wm_color = imagecolorallocatealpha($dst_img, $red, $green, $blue, 90); 
imagettftext($dst_img, $this->wm_size, $this->wm_angle, $this->wm_x, $this->wm_y, $wm_color, $this->wm_fontfile, $this->wm_text); 
} 
if ($this->save_file) 
{ 
switch ($this->output_type){ 
  case 'gif': 
  $src_img=ImagePNG($dst_img, $this->save_file); 
  break; 
  case 'jpeg': 
  $src_img=ImageJPEG($dst_img, $this->save_file, $this->jpeg_quality); 
  break; 
  case 'png': 
  $src_img=ImagePNG($dst_img, $this->save_file); 
  break; 
  default: 
  $src_img=ImageJPEG($dst_img, $this->save_file, $this->jpeg_quality); 
  break; 
}   
} 
else 
{ 
header("Content-type: image/{$this->output_type}"); 
switch ($this->output_type){ 
  case 'gif': 
  $src_img=ImagePNG($dst_img); 
  break; 
  case 'jpeg': 
  $src_img=ImageJPEG($dst_img, "", $this->jpeg_quality); 
  break; 
  case 'png': 
  $src_img=ImagePNG($dst_img); 
  break; 
  default: 
  $src_img=ImageJPEG($dst_img, "", $this->jpeg_quality); 
  break; 
} 
} 
imagedestroy($dst_img); 
} 
function get_type()//获取图像文件类型 
{ 
$name_array = explode("。
  ",$this->filename); 
if (preg_match("/\。
  (jpg|jpeg|gif|png)$/", $this->filename, $matches)) 
{ 
$this->input_type = strtolower($matches[1]); 
} 
else 
{ 
$this->input_type = "string"; 
} 
} 
} 
?>。