加水印的问题~~水印图片的背景怎么才能透明？

upload.class.php  (1/2)<?php
class upload {        var $dir;                         //附件存放物理目录
        var $time;                         //自定义文件上传时间
        var $allow_types;         //允许上传附件类型
        var $field;                         //上传控件名称
        var $maxsize;                 //最大允许文件大小，单位为KB        var $thumb_width;    //缩略图宽度
        var $thumb_height;   //缩略图高度        var $water_file; //水印图片地址
        var $water_pos;  //水印位置
        var $water_trans;//水印透明度
        //构造函数
        //$types : 允许上传的文件类型 , $maxsize : 允许大小 ,  $field : 上传控件名称 , $time : 自定义上传时间
        function upload($types = 'jpg|png', $maxsize = 1024, $field = 'attach', $time = '') {
                $this->allow_types = explode('|',$types);
                $this->maxsize = $maxsize * 1024;
                $this->field = $field;
                $this->time = $time ? $time : time();
        }        //设置并创建文件具体存放的目录
        //$basedir  : 基目录，必须为物理路径
        //$filedir  : 自定义子目录，可用参数{y}、{m}、{d}
        function set_dir($basedir,$filedir = '') {
                $dir = $basedir;
                !is_dir($dir) && @mkdir($dir,0777);
                if (!empty($filedir)) {
                        $filedir = str_replace(array('{y}','{m}','{y}'),array(date('Y',$this->time),date('m',$this->time),date('d',$this->time)),strtolower($filedir));
                        $dirs = explode('/',$filedir);
                        foreach ($dirs as $d) {
                                !empty($d) && $dir .= $d.'/';
                                !is_dir($dir) && @mkdir($dir,0777);
                        }
                }
                $this->dir = $dir;
        }        //图片缩略图设置，如果不生成缩略图则不用设置
        //$width : 缩略图宽度 , $height : 缩略图高度
        function set_thumb ($width = 0, $height = 0) {
                $this->thumb_width  = $width;
                $this->thumb_height = $height;
        }        //图片水印设置，如果不生成添加水印则不用设置
        //$file : 水印图片 , $pos : 水印位置 , $trans : 水印透明度
        function set_water ($file, $pos = 6, $trans = 80) {
                $this->water_file  = $file;
                $this->water_pos   = $pos;
                $this->water_trans = $trans;
        }                function execute() {
                $files = array(); //成功上传的文件信息
                $field = $this->field;
                $keys = array_keys($_FILES[$field]['name']);
                foreach ($keys as $key) {
                        if (!$_FILES[$field]['name'][$key]) continue;

                        $fileext = $this->fileext($_FILES[$field]['name'][$key]); //获取文件扩展名
                        $filename = $this->time.mt_rand(100,999).'.'.$fileext; //生成文件名
                        $filedir = $this->dir;        //附件实际存放目录
                        $filesize = $_FILES[$field]['size'][$key]; //文件大小

                        //文件类型不允许
                        if (!in_array($fileext,$this->allow_types)) {
                                $files[$key]['name'] = $_FILES[$field]['name'][$key];
                                $files[$key]['flag'] = -1;
                                continue;
                        }                        //文件大小超出
                        if ($filesize > $this->maxsize) {
                                $files[$key]['name'] = $_FILES[$field]['name'][$key];
                                $files[$key]['flag'] = -2;
                                continue;
                        }                        $files[$key]['name'] = $filename;
                        $files[$key]['dir'] = $filedir;
                        $files[$key]['size'] = $filesize;                        //保存上传文件并删除临时文件
                        if (is_uploaded_file($_FILES[$field]['tmp_name'][$key])) {
                                move_uploaded_file($_FILES[$field]['tmp_name'][$key],$filedir.$filename);
                                @unlink($_FILES[$field]['tmp_name'][$key]);
                                $files[$key]['flag'] = 1;                                //对图片进行加水印和生成缩略图
                                if (in_array($fileext,array('jpg','png','gif'))) {
                                        if ($this->thumb_width) {
                                                if ($this->create_thumb($filedir.$filename,$filedir.'thumb_'.$filename)) {
                                                        $files[$key]['thumb'] = 'thumb_'.$filename;  //缩略图文件名
                                                }
                                        }
                                        $this->create_water($filedir.$filename);
                                }
                        }
                }                return $files;
        }        //创建缩略图,以相同的扩展名生成缩略图
        //$src_file : 来源图像路径 , $thumb_file : 缩略图路径
        function create_thumb ($src_file,$thumb_file) {
                $t_width  = $this->thumb_width;
                $t_height = $this->thumb_height;                if (!file_exists($src_file)) return false;                $src_info = getImageSize($src_file);                //如果来源图像小于或等于缩略图则拷贝源图像作为缩略图
                if ($src_info[0] <= $t_width && $src_info[1] <= $t_height) {
                        if (!copy($src_file,$thumb_file)) {
                                return false;
                        }
                        return true;
                }                //按比例计算缩略图大小
                if ($src_info[0] - $t_width > $src_info[1] - $t_height) {
                        $t_height = ($t_width / $src_info[0]) * $src_info[1];
                } else {
                        $t_width = ($t_height / $src_info[1]) * $src_info[0];
                }

upload.class.php(2/2)
//取得文件扩展名
                $fileext = $this->fileext($src_file);                switch ($fileext) {
                        case 'jpg' :
                                $src_img = ImageCreateFromJPEG($src_file); break;
                        case 'png' :
                                $src_img = ImageCreateFromPNG($src_file); break;
                        case 'gif' :
                                $src_img = ImageCreateFromGIF($src_file); break;
                }                //创建一个真彩色的缩略图像
                $thumb_img = @ImageCreateTrueColor($t_width,$t_height);                //ImageCopyResampled函数拷贝的图像平滑度较好，优先考虑
                if (function_exists('imagecopyresampled')) {
                        @ImageCopyResampled($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);
                } else {
                        @ImageCopyResized($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);
                }                //生成缩略图
                switch ($fileext) {
                        case 'jpg' :
                                ImageJPEG($thumb_img,$thumb_file); break;
                        case 'gif' :
                                ImageGIF($thumb_img,$thumb_file); break;
                        case 'png' :
                                ImagePNG($thumb_img,$thumb_file); break;
                }                //销毁临时图像
                @ImageDestroy($src_img);
                @ImageDestroy($thumb_img);                return true;        }        //为图片添加水印
        //$file : 要添加水印的文件
        function create_water ($file) {                //文件不存在则返回
                if (!file_exists($this->water_file) || !file_exists($file)) return;
                if (!function_exists('getImageSize')) return;

                //检查GD支持的文件类型
                $gd_allow_types = array();
                if (function_exists('ImageCreateFromGIF')) $gd_allow_types['image/gif'] = 'ImageCreateFromGIF';
                if (function_exists('ImageCreateFromPNG')) $gd_allow_types['image/png'] = 'ImageCreateFromPNG';
                if (function_exists('ImageCreateFromJPEG')) $gd_allow_types['image/jpeg'] = 'ImageCreateFromJPEG';                //获取文件信息
                $fileinfo = getImageSize($file);
                $wminfo   = getImageSize($this->water_file);                if ($fileinfo[0] < $wminfo[0] || $fileinfo[1] < $wminfo[1]) return;                if (array_key_exists($fileinfo['mime'],$gd_allow_types)) {
                        if (array_key_exists($wminfo['mime'],$gd_allow_types)) {

                                //从文件创建图像
                                $temp = $gd_allow_types[$fileinfo['mime']]($file);
                                $temp_wm = $gd_allow_types[$wminfo['mime']]($this->water_file);                                //水印位置
                                switch ($this->water_pos) {
                                        case 1 :  //顶部居左
                                                $dst_x = 0; $dst_y = 0; break;
                                        case 2 :  //顶部居中
                                                $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = 0; break;
                                        case 3 :  //顶部居右
                                                $dst_x = $fileinfo[0]; $dst_y = 0; break;
                                        case 4 :  //底部居左
                                                $dst_x = 0; $dst_y = $fileinfo[1]; break;
                                        case 5 :  //底部居中
                                                $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = $fileinfo[1]; break;
                                        case 6 :  //底部居右
                                                $dst_x = $fileinfo[0]-$wminfo[0]; $dst_y = $fileinfo[1]-$wminfo[1]; break;
                                        default : //随机
                                                $dst_x = mt_rand(0,$fileinfo[0]-$wminfo[0]); $dst_y = mt_rand(0,$fileinfo[1]-$wminfo[1]);
                                }                                if (function_exists('ImageAlphaBlending')) ImageAlphaBlending($temp_wm,True); //设定图像的混色模式
                                if (function_exists('ImageSaveAlpha')) ImageSaveAlpha($temp_wm,True); //保存完整的 alpha 通道信息                                //为图像添加水印
                                if (function_exists('imageCopyMerge')) {
                                        ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1],$this->water_trans);
                                } else {
                                        ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1]);
                                }                                //保存图片
                                switch ($fileinfo['mime']) {
                                        case 'image/jpeg' :
                                                @imageJPEG($temp,$file);
                                                break;
                                        case 'image/png' :
                                                @imagePNG($temp,$file);
                                                break;
                                        case 'image/gif' :
                                                @imageGIF($temp,$file);
                                                break;
                                }
                                //销毁零时图像
                                @imageDestroy($temp);
                                @imageDestroy($temp_wm);
                        }
                }
        }        //获取文件扩展名
        function fileext($filename) {
                return strtolower(substr(strrchr($filename,'.'),1,10));
        }
}
?>

调用代码：<?php
if ($_GET['action'] == 'save') {
include_once("upload.class.php");
    $up = new upload();
    $up->set_dir(dirname(__FILE__).'/upload/','{y}/{m}');
    $up->set_thumb(100,80);
    $up->set_water(dirname(__FILE__).'/images/waterimg.png',6,30);
    $fs = $up->execute();

    var_dump($fs);
}
?>
<html>
    <head><title>test</title></head>
    <body style="margin:0;padding:0">
    <form name="upload" method="post" action="?action=save" enctype="multipart/form-data" style="margin:0">
        <input type="file" name="attach[]" />
        <input type="file" name="attach[]" />
        <input type="submit" name="submit" value="上传" />
    </form>
    </body>
</html>

由于upload.class.php 代码太长分成两个了直接凑到一起即可...
谢谢大虾帮忙看看

相当简单...弄张透明的gif或者png图片就欧了！给哥哥分啊！哈哈哈

我自己解决了...
具体的解决方案是：
1.查找上面的代码“//为图像添加水印” 这个下面的if和else里面的内容；
2.把if else注释掉；
3.替换成这个...imagecopy($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1]);
imagedestroy($temp_wm);
多谢~~~

调试易

加水印的问题~~水印图片的背景怎么才能透明？

解决方案 »