jpge圖片與png圖片的融合,其實就是大家熟悉的浮水印技術。下面程式碼中最重要的一句為:
//設定影像的混色模式 imagealphablending($ground_im, true);
-
/*
- * 功能:PHP圖片浮水印(水印支援圖片或文字)
- * 參數:
- * $groundImage 背景圖片,即需要加浮水印的圖片,暫只支援GIF,JPG,PNG格式;
- * $waterPos 水印位置,有10種狀態,0為隨機位置;
- * 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 圖片浮水印,即作為浮水印的圖片,暫只支援GIF,JPG,PNG格式;
- * $waterText 文字水印,即把文字作為為水印,支援ASCII碼,不支援中文;
- * $textFont 文字大小,值為1、2、3、4或5,預設為5;
- * $textColor 文字顏色,值為十六進位顏色值,預設為#FF0000(紅色);
- *
- * 注意:Support GD 2.0,Support FreeType、GIF Read、GIF Create、JPG 、PNG
- * $waterImage 和$waterText 最好不要同時使用,選其中一個即可,優先使用$waterImage。
- * 當$waterImage有效時,參數$waterString、$stringFont、$stringColor皆不生效。
- * 加浮水印後的圖片的檔案名稱和 $groundImage 一樣。
- * 作者:longware @ 2004-11-3 14:15:13
- */
-
- function imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText=" ",$textFont=5,$textColor="#FF0000")
- //function imageWaterMark($groundImage,$waterPos=0,$waterImage,$waterText=,$textFont=5,$textColor″=#FF0000″)
- {
- $isWaterImage = FALSE;
- $formatMsg = "暫時不支援此檔案格式,請用圖片處理軟體將圖片轉換為GIF、JPG、PNG格式。";
- //讀取浮水印檔案
- if(!empty($waterImage) && file_exists($waterImage))
- {
- $isWaterImage = TR$;
- $water_info = getimagesize( waterImage);
- $water_w = $water_info[0];//取得浮水印圖片的寬度
- $water_h = $water_info[1];//取得浮水印圖片的高
- switch($water_info[2 ])//取得浮水印圖片的格式
- {
- case 1:$water_im = imagecreatefromgif($waterImage);break;
- case 2:$water_im = imagecreatefromjpeg($waterImage);break;
- case 3:$water_im = imagecreatefrompng($waterImage);break;
- default:die($formatMsg);
- }
- }
- //讀?塵巴計?
- if(! empty($groundImage) && file_exists($groundImage))
- {
- $ground_info = getimagesize($groundImage);
- $ground_w = $ground_info[0];//取得背景圖片的寬
- $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;
- format);
- }
- }
- else
- {
- die("需要浮水印的圖片不存在! ");
- }
- //水印位置
- if($isWaterImage)//圖片浮水印
- {
- $w = $water_w;
- $h = $water_h;
- $label = "圖片的";
- }
- else//文字浮水印
- {
- $temp = imagettfbbox(ceil($textFont*5),0,"./cour.ttf" ,$waterText);//取得使用TrueType 字型的文字的範圍
- $w = $temp[2] - $temp[6];
- $h = $temp[3] - $temp[7] ;
- unset($temp);
- $label = "文字區域";
- }
- if( ($ground_w {
- echo "需要加浮水印的圖片的長度或寬度比水印".$label."還小,無法產生浮水印! ";
- return;
- }
- switch($waterPos)
- {
- case 0://隨機
- $posX = rand(0,($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;
- break;
- default://隨機
- $posX = rand(0,($ground_w - $w));
- $posY = rand(0,($ground_h - $h));
- break ;
- }
- //設定影像的混色模式
- imagealphablending($ground_im, true);
- if($isWaterImage)//圖片浮水印
- {
- imagecopy($ground_imagecopy($ground_imagecopy($ground_imagecopy($ground_imagecopy($ground_imagecopy($ground_imagecopy($ground_imagecopy($ground_image) , $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷貝水印到目標檔案
- }
- else//文字浮水印
- {
- 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, $B));
- }
- }
- //產生浮水印後的圖片
- @unlink($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,$groundImage);break;
- case 3:imagepng($ground_im,$groundImage);break;
- default:die($errorMsg) ;
- }
-
- //釋放記憶體
- if(isset($water_info)) unset($water_info);
- if(isset($water_im)) imagedestroy($water_im);
- unset($ground_info);
- imagedestroy($ground_im);
- }
- $uploadfile="your_picture.jpg"; //待處理的背景圖片位置
- $waterImage="Hat. png"; //透明圖片位置
- imageWaterMark($uploadfile,9,$waterImage);
- //在web上顯示出來
- echo "";
?>
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