【php】jpge图片与png图片的融合

kaola4549

　　jpge图片与png图片的融合，其实就是大家熟悉的水印技术。下面代码中最重要的一句为：
　　//设定图像的混色模式
imagealphablending($ground_im, true);
　　OK， Code talks~
　　<?php/** 功能：PHP图片水印 (水印支持图片或文字)* 参数：* $groundImage 背景图片，即需要加水印的图片，暂只支持GIF,JPG,PNG格式；* $waterPos 水印位置，有10种状态，0为随机位置；* 1为顶端居左，2为顶端居中，3为顶端居右；* 4为中部居左，5为中部居中，6为中部居右；* 7为底端居左，8为底端居中，9为底端居右；* $waterImage 图片水印，即作为水印的图片，暂只支持GIF,JPG,PNG格式；* $waterText 文字水印，即把文字作为为水印，支持ASCII码，不支持中文；* $textFont 文字大小，值为1、2、3、4或5，默认为5；* $textColor 文字颜色，值为十六进制颜色值，默认为#FF0000(红色)；** 注意：Support GD 2.0，Support FreeType、GIF Read、GIF Create、JPG 、PNG* $waterImage 和 $waterText 最好不要同时使用，选其中之一即可，优先使用 $waterImage。* 当$waterImage有效时，参数$waterString、$stringFont、$stringColor均不生效。* 加水印后的图片的文件名和 $groundImage 一样。* 作者：longware @ 2004-11-3 14:15:13*/function imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000")//function imageWaterMark($groundImage,$waterPos=0,$waterImage,$waterText=,$textFont=5,$textColor=#FF0000″){$isWaterImage = FALSE;$formatMsg = "暂不支持该文件格式，请用图片处理软件将图片转换为GIF、JPG、PNG格式。";//读取水印文件if(!empty($waterImage) && file_exists($waterImage)){$isWaterImage = TRUE;$water_info = getimagesize($waterImage);$water_w = $water_info[0];//取得水印图片的宽$water_h = $water_info[1];//取得水印图片的高switch($water_info[2])//取得水印图片的格式{case 1:$water_im = imagecreatefromgif($waterImage);break;case 2:$water_im = imagecreatefromjpeg($waterImage);break;case 3:$water_im = imagecreatefrompng($waterImage);break;default:die($formatMsg);}}//读?尘巴计?if(!empty($groundImage) && file_exists($groundImage)){$ground_info = getimagesize($groundImage);$ground_w = $ground_info[0];//取得背景图片的宽$ground_h = $ground_info[1];//取得背景图片的高switch($ground_info[2])//取得背景图片的格式{case 1:$ground_im = imagecreatefromgif($groundImage);break;case 2:$ground_im = imagecreatefromjpeg($groundImage);break;case 3:$ground_im = imagecreatefrompng($groundImage);break;default:die($formatMsg);}}else{die("需要加水印的图片不存在！");}//水印位置if($isWaterImage)//图片水印{$w = $water_w;$h = $water_h;$label = "图片的";}else//文字水印{$temp = imagettfbbox(ceil($textFont*5),0,"./cour.ttf",$waterText);//取得使用 TrueType 字体的文本的范围$w = $temp[2] - $temp[6];$h = $temp[3] - $temp[7];unset($temp);$label = "文字区域";}if( ($ground_w<$w) || ($ground_h<$h) ){echo "需要加水印的图片的长度或宽度比水印".$label."还小，无法生成水印！";return;}switch($waterPos){case 0://随机$posX = rand(0,($ground_w - $w));$posY = rand(0,($ground_h - $h));break;case 1://1为顶端居左$posX = 0;$posY = 0;break;case 2://2为顶端居中$posX = ($ground_w - $w) / 2;$posY = 0;break;case 3://3为顶端居右$posX = $ground_w - $w;$posY = 0;break;case 4://4为中部居左$posX = 0;$posY = ($ground_h - $h) / 2;break;case 5://5为中部居中$posX = ($ground_w - $w) / 2;$posY = ($ground_h - $h) / 2;break;case 6://6为中部居右$posX = $ground_w - $w;$posY = ($ground_h - $h) / 2;break;case 7://7为底端居左$posX = 0;$posY = $ground_h - $h;break;case 8://8为底端居中$posX = ($ground_w - $w) / 2;$posY = $ground_h - $h;break;case 9://9为底端居右$posX = $ground_w - $w;$posY = $ground_h - $h;break;default://随机$posX = rand(0,($ground_w - $w));$posY = rand(0,($ground_h - $h));break;}//设定图像的混色模式imagealphablending($ground_im, true);if($isWaterImage)//图片水印{imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷贝水印到目标文件}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("水印文字颜色格式不正确！");}imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));}//生成水印后的图片@unlink($groundImage);switch($ground_info[2])//取得背景图片的格式{case 1:imagegif($ground_im,$groundImage);break;case 2:imagejpeg($ground_im,$groundImage);break;case 3:imagepng($ground_im,$groundImage);break;default:die($errorMsg);}//释放内存if(isset($water_info)) unset($water_info);if(isset($water_im)) imagedestroy($water_im);unset($ground_info);imagedestroy($ground_im);}$uploadfile="your_picture.jpg";//待处理的背景图片位置$waterImage="Hat.png"; //透明图片位置imageWaterMark($uploadfile,9,$waterImage);//在web上显示出来echo "<img src="/" mce_src="/""".$uploadfile."/" border=/"0/">";?>