PHP應(yīng)用
/*
  * 功能：PHP圖片水印,水印支持圖片或文字
  * 參數(shù)：
  * $groundImage 背景圖片,即需要加水印的圖片,暫只支持GIF,JPG,PNG格式；
  * $waterPos 水印位置,有10種狀態(tài),0為隨機(jī)位置；
  *  1為頂端居左,2為頂端居中,3為頂端居右；
  *  4為中部居左,5為中部居中,6為中部居右；
  *  7為底端居左,8為底端居中,9為底端居右；
  * $waterImage 圖片水印,即作為水印的圖片,暫只支持GIF,JPG,PNG格式；
  * $alpha 水印透明度,取值1-100；
  * $waterText 文字水印,即把文字作為為水印,支持ASCII碼,不支持中文；
  * $textFont 文字大小,值為1、2、3、4或5,默認(rèn)為5；
  * $textColor 文字顏色,值為十六進(jìn)制顏色值,默認(rèn)為#FF0000(紅色)；
  *
  * $waterImage 和 $waterText 最好不要同時(shí)使用,選其中之一即可,優(yōu)先使用 $waterImage.
  * 當(dāng)$waterImage有效時(shí),參數(shù)$waterString、$stringFont、$stringColor均不生效.
  * 加水印后的圖片的文件名和 $groundImage 一樣.
*/
function imageWaterMark($groundImage, $waterPos=0, $waterImage='', $alpha=80, $waterText='', $water_fontfile, $textFont=9, $textColor='#FF0000'){
  $isWaterImage = FALSE;
  $formatMsg = '不支持該圖片格式!請(qǐng)使用GIF、JPG、PNG格式的圖片.';
  $fontFile = $water_fontfile;
  //讀取水印文件
  if(!empty($waterImage) && file_exists($waterImage)){
    $isWaterImage = TRUE;
    $water_info = getimagesize($waterImage);
    $water_w = $water_info[0];//取得水印圖片的寬
    $water_h = $water_info[1];//取得水印圖片的高
    switch($water_info[2]){//取得水印圖片的格式
      case 1:$water_im = imagecreatefromgif($waterImage);break;
      case 2:$water_im = imagecreatefromjpeg($waterImage);break;
      case 3:$water_im = imagecreatefrompng($waterImage);break;
      default:die($formatMsg);
    }
  }
  //讀取背景圖片
  if(!empty($groundImage) && file_exists($groundImage)){
    $ground_info = getimagesize($groundImage);
    $ground_w = $ground_info[0];//取得背景圖片的寬
    $ground_h = $ground_info[1];//取得背景圖片的高
    switch($ground_info[2]){//取得背景圖片的格式
      case 1:$ground_im = imagecreatefromgif($groundImage);break;
      case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
      case 3:$ground_im = imagecreatefrompng($groundImage);break;
      default:die($formatMsg);
    }
  }else{
    alert("水印圖片不存在!");
  }
  //水印位置
  if($isWaterImage){//圖片水印
    $w = $water_w;
    $h = $water_h;
    $label = "圖片的";
  }else{//文字水印
    $temp = imagettfbbox($textFont, 0, $fontFile, $waterText);//取得使用 TrueType 字體的文本的范圍
    $w = $temp[2] - $temp[6];
    $h = $temp[3] - $temp[7];
    unset($temp);
    $label = "文字區(qū)域";
  }
  if(($ground_w<$w) || ($ground_h<$h)){
    echo "需要加水印的圖片的長(zhǎng)度或?qū)挾缺人?.$label."還小,無法生成水印!";
    return;
  }
  switch($waterPos){
    case 0://隨機(jī)
    $posX = rand(0,($ground_w - $w));
    $posY = rand(0,($ground_h - $h));
    break;
    case 1://1為頂端居左
    $posX = 0;
    $posY = 0;
    break;
    case 2://2為頂端居中
    $posX = ($ground_w - $w) / 2;
    $posY = 0;
    break;
    case 3://3為頂端居右
    $posX = $ground_w - $w;
    $posY = 0;
    break;
    case 4://4為中部居左
    $posX = 0;
    $posY = ($ground_h - $h) / 2;
    break;
    case 5://5為中部居中
    $posX = ($ground_w - $w) / 2;
    $posY = ($ground_h - $h) / 2;
    break;
    case 6://6為中部居右
    $posX = $ground_w - $w;
    $posY = ($ground_h - $h) / 2;
    break;
    case 7://7為底端居左
    $posX = 0;
    $posY = $ground_h - $h;
    break;
    case 8://8為底端居中
    $posX = ($ground_w - $w) / 2;
    $posY = $ground_h - $h;
    break;
    case 9://9為底端居右
    $posX = $ground_w - $w;
    $posY = $ground_h - $h;
    if(!$isWaterImage){
    $posY = $ground_h - $h-20;
    }
    break;
    default://隨機(jī)
    $posX = rand(0,($ground_w - $w));
    $posY = rand(0,($ground_h - $h));
    break;
  }
  //設(shè)定圖像的混色模式
  imagealphablending($ground_im, true);
  if($isWaterImage){//圖片水印
    //imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷貝水印到目標(biāo)文件
    //生成混合圖像
    imagecopymerge($ground_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h, $alpha);
  } else {//文字水印
    if( !empty($textColor) && (strlen($textColor)==7)){
      $R = hexdec(substr($textColor,1,2));
      $G = hexdec(substr($textColor,3,2));
      $B = hexdec(substr($textColor,5));
    } else {
      die("水印文字顏色格式不正確!");
    }
    imagestring($ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
  }
  //生成水印后的圖片
  @unlink($groundImage);
  switch($ground_info[2]){//取得背景圖片的格式
    case 1:imagegif($ground_im,$groundImage);break;
    case 2:imagejpeg($ground_im,$groundImage,100);break;//注意這里的100,經(jīng)測(cè)試,100是圖片質(zhì)量最佳的,但文件大小會(huì)增加很多,95的時(shí)候質(zhì)量還不錯(cuò),大小和原來的差不多.作者采用95的值.
    case 3:imagepng($ground_im,$groundImage);break;
    default:die($errorMsg);
  }
  //釋放內(nèi)存
  if(isset($water_info)) unset($water_info);
  if(isset($water_im)) imagedestroy($water_im);
  unset($ground_info);
  imagedestroy($ground_im);
}

PHP應(yīng)用
 /* 水印配置開始 */
  $water_mark = 1;//1為加水印, 其它為不加
  $water_pos = 9;//水印位置,10種狀態(tài)【0為隨機(jī),1為頂端居左,2為頂端居中,3為頂端居右；4為中部居左,5為中部居中,6為中部居右；7為底端居左,8為底端居中,9為底端居】
  $water_img = $_SERVER['DOCUMENT_ROOT'].'/upfiles/water.gif';//水印圖片,默認(rèn)填寫空,請(qǐng)將圖片上傳至網(wǎng)站根目錄的upfiles下,例: water.gif
  $water_alpha = 50;//水印透明度
  $water_text = '';//水印字符串,默認(rèn)填寫空;
  //$water_fontfile = $_SERVER['DOCUMENT_ROOT'] .'/upfiles/fonts/arial.ttf';//文字水印使用的字體;
  if($water_mark == 1){
    imageWaterMark($file_path, $water_pos, $water_img, $water_alpha, $water_text, $water_fontfile);
  }
  /* 水印配置結(jié)束 */