thinkphp image类添加png图片水印不投明问题

来源:互联网 发布:propolinse漱口水知乎 编辑:程序博客网 时间:2024/05/06 06:58

1、添加水印可以参照手册,直接引入image类,使用water方法即可

2、在导入类后,我们发现如果使用png图片作为水印背景,会出现添加水印时原来应该是透明的部分变成了黑色

3、在网上找了一番之后,对image类的water方法做下述修改

大约在82行

        //生成混合图像        // imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo['width'], $wInfo['height'], $alpha);        imagecopy($sImage, $wImage, $posX, $posY, 0, 0, $wInfo['width'], $wInfo['height']);
对,你没有看错,把他原来的注释掉,改成下面的就好了。


下面放上整个image类的代码,便于以后查看下载

<?php// +----------------------------------------------------------------------// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]// +----------------------------------------------------------------------// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.// +----------------------------------------------------------------------// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )// +----------------------------------------------------------------------// | Author: liu21st <liu21st@gmail.com>// +----------------------------------------------------------------------/** * 图像操作类库 * @category   ORG * @package  ORG * @subpackage  Util * @author    liu21st <liu21st@gmail.com> */class Image {    /**     * 取得图像信息     * @static     * @access public     * @param string $image 图像文件名     * @return mixed     */    static function getImageInfo($img) {        $imageInfo = getimagesize($img);        if ($imageInfo !== false) {            $imageType = strtolower(substr(image_type_to_extension($imageInfo[2]), 1));            $imageSize = filesize($img);            $info = array(                "width" => $imageInfo[0],                "height" => $imageInfo[1],                "type" => $imageType,                "size" => $imageSize,                "mime" => $imageInfo['mime']            );            return $info;        } else {            return false;        }    }    /**     * 为图片添加水印     * @static public     * @param string $source 原文件名     * @param string $water  水印图片     * @param string $$savename  添加水印后的图片名     * @param string $alpha  水印的透明度     * @return void     */    static public function water($source, $water, $savename=null, $alpha=80) {        //检查文件是否存在        if (!file_exists($source) || !file_exists($water))            return false;        //图片信息        $sInfo = self::getImageInfo($source);        $wInfo = self::getImageInfo($water);        //如果图片小于水印图片,不生成图片        if ($sInfo["width"] < $wInfo["width"] || $sInfo['height'] < $wInfo['height'])            return false;        //建立图像        $sCreateFun = "imagecreatefrom" . $sInfo['type'];        $sImage = $sCreateFun($source);        $wCreateFun = "imagecreatefrom" . $wInfo['type'];        $wImage = $wCreateFun($water);        //设定图像的混色模式        imagealphablending($wImage, true);        //图像位置,默认为右下角右对齐        $posY = $sInfo["height"] - $wInfo["height"];        $posX = $sInfo["width"] - $wInfo["width"];        //生成混合图像        // imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo['width'], $wInfo['height'], $alpha);        imagecopy($sImage, $wImage, $posX, $posY, 0, 0, $wInfo['width'], $wInfo['height']);        //输出图像        $ImageFun = 'Image' . $sInfo['type'];        //如果没有给出保存文件名,默认为原图像名        if (!$savename) {            $savename = $source;            @unlink($source);        }        //保存图像        $ImageFun($sImage, $savename);        imagedestroy($sImage);    }    function showImg($imgFile, $text='', $x='10', $y='10', $alpha='50') {        //获取图像文件信息        //2007/6/26 增加图片水印输出,$text为图片的完整路径即可        $info = Image::getImageInfo($imgFile);        if ($info !== false) {            $createFun = str_replace('/', 'createfrom', $info['mime']);            $im = $createFun($imgFile);            if ($im) {                $ImageFun = str_replace('/', '', $info['mime']);                //水印开始                if (!empty($text)) {                    $tc = imagecolorallocate($im, 0, 0, 0);                    if (is_file($text) && file_exists($text)) {//判断$text是否是图片路径                        // 取得水印信息                        $textInfo = Image::getImageInfo($text);                        $createFun2 = str_replace('/', 'createfrom', $textInfo['mime']);                        $waterMark = $createFun2($text);                        //$waterMark=imagecolorallocatealpha($text,255,255,0,50);                        $imgW = $info["width"];                        $imgH = $info["width"] * $textInfo["height"] / $textInfo["width"];                        //$y=($info["height"]-$textInfo["height"])/2;                        //设置水印的显示位置和透明度支持各种图片格式                        imagecopymerge($im, $waterMark, $x, $y, 0, 0, $textInfo['width'], $textInfo['height'], $alpha);                    } else {                        imagestring($im, 80, $x, $y, $text, $tc);                    }                    //ImageDestroy($tc);                }                //水印结束                if ($info['type'] == 'png' || $info['type'] == 'gif') {                    imagealphablending($im, FALSE); //取消默认的混色模式                    imagesavealpha($im, TRUE); //设定保存完整的 alpha 通道信息                }                Header("Content-type: " . $info['mime']);                $ImageFun($im);                @ImageDestroy($im);                return;            }            //保存图像            $ImageFun($sImage, $savename);            imagedestroy($sImage);            //获取或者创建图像文件失败则生成空白PNG图片            $im = imagecreatetruecolor(80, 30);            $bgc = imagecolorallocate($im, 255, 255, 255);            $tc = imagecolorallocate($im, 0, 0, 0);            imagefilledrectangle($im, 0, 0, 150, 30, $bgc);            imagestring($im, 4, 5, 5, "no pic", $tc);            Image::output($im);            return;        }    }    /**     * 生成缩略图     * @static     * @access public     * @param string $image  原图     * @param string $type 图像格式     * @param string $thumbname 缩略图文件名     * @param string $maxWidth  宽度     * @param string $maxHeight  高度     * @param string $position 缩略图保存目录     * @param boolean $interlace 启用隔行扫描     * @return void     */    static function thumb($image, $thumbname, $type='', $maxWidth=200, $maxHeight=50, $interlace=true) {        // 获取原图信息        $info = Image::getImageInfo($image);        if ($info !== false) {            $srcWidth = $info['width'];            $srcHeight = $info['height'];            $type = empty($type) ? $info['type'] : $type;            $type = strtolower($type);            $interlace = $interlace ? 1 : 0;            unset($info);            $scale = min($maxWidth / $srcWidth, $maxHeight / $srcHeight); // 计算缩放比例            if ($scale >= 1) {                // 超过原图大小不再缩略                $width = $srcWidth;                $height = $srcHeight;            } else {                // 缩略图尺寸                $width = (int) ($srcWidth * $scale);                $height = (int) ($srcHeight * $scale);            }            // 载入原图            $createFun = 'ImageCreateFrom' . ($type == 'jpg' ? 'jpeg' : $type);            if(!function_exists($createFun)) {                return false;            }            $srcImg = $createFun($image);            //创建缩略图            if ($type != 'gif' && function_exists('imagecreatetruecolor'))                $thumbImg = imagecreatetruecolor($width, $height);            else                $thumbImg = imagecreate($width, $height);              //png和gif的透明处理 by luofei614            if('png'==$type){                imagealphablending($thumbImg, false);//取消默认的混色模式(为解决阴影为绿色的问题)                imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息(为解决阴影为绿色的问题)                }elseif('gif'==$type){                $trnprt_indx = imagecolortransparent($srcImg);                 if ($trnprt_indx >= 0) {                        //its transparent                       $trnprt_color = imagecolorsforindex($srcImg , $trnprt_indx);                       $trnprt_indx = imagecolorallocate($thumbImg, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']);                       imagefill($thumbImg, 0, 0, $trnprt_indx);                       imagecolortransparent($thumbImg, $trnprt_indx);              }            }            // 复制图片            if (function_exists("ImageCopyResampled"))                imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);            else                imagecopyresized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);            // 对jpeg图形设置隔行扫描            if ('jpg' == $type || 'jpeg' == $type)                imageinterlace($thumbImg, $interlace);            // 生成图片            $imageFun = 'image' . ($type == 'jpg' ? 'jpeg' : $type);            $imageFun($thumbImg, $thumbname);            imagedestroy($thumbImg);            imagedestroy($srcImg);            return $thumbname;        }        return false;    }    /**     * 根据给定的字符串生成图像     * @static     * @access public     * @param string $string  字符串     * @param string $size  图像大小 width,height 或者 array(width,height)     * @param string $font  字体信息 fontface,fontsize 或者 array(fontface,fontsize)     * @param string $type 图像格式 默认PNG     * @param integer $disturb 是否干扰 1 点干扰 2 线干扰 3 复合干扰 0 无干扰     * @param bool $border  是否加边框 array(color)     * @return string     */    static function buildString($string, $rgb=array(), $filename='', $type='png', $disturb=1, $border=true) {        if (is_string($size))            $size = explode(',', $size);        $width = $size[0];        $height = $size[1];        if (is_string($font))            $font = explode(',', $font);        $fontface = $font[0];        $fontsize = $font[1];        $length = strlen($string);        $width = ($length * 9 + 10) > $width ? $length * 9 + 10 : $width;        $height = 22;        if ($type != 'gif' && function_exists('imagecreatetruecolor')) {            $im = @imagecreatetruecolor($width, $height);        } else {            $im = @imagecreate($width, $height);        }        if (empty($rgb)) {            $color = imagecolorallocate($im, 102, 104, 104);        } else {            $color = imagecolorallocate($im, $rgb[0], $rgb[1], $rgb[2]);        }        $backColor = imagecolorallocate($im, 255, 255, 255);    //背景色(随机)        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色        $pointColor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));                 //点颜色        @imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);        @imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);        @imagestring($im, 5, 5, 3, $string, $color);        if (!empty($disturb)) {            // 添加干扰            if ($disturb = 1 || $disturb = 3) {                for ($i = 0; $i < 25; $i++) {                    imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $pointColor);                }            } elseif ($disturb = 2 || $disturb = 3) {                for ($i = 0; $i < 10; $i++) {                    imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $pointColor);                }            }        }        Image::output($im, $type, $filename);    }    /**     * 生成图像验证码     * @static     * @access public     * @param string $length  位数     * @param string $mode  类型     * @param string $type 图像格式     * @param string $width  宽度     * @param string $height  高度     * @return string     */    static function buildImageVerify($length=4, $mode=1, $type='png', $width=48, $height=22, $verifyName='verify') {        import('ORG.Util.String');        $randval = String::randString($length, $mode);        session($verifyName, md5($randval));        $width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;        if ($type != 'gif' && function_exists('imagecreatetruecolor')) {            $im = imagecreatetruecolor($width, $height);        } else {            $im = imagecreate($width, $height);        }        $r = Array(225, 255, 255, 223);        $g = Array(225, 236, 237, 255);        $b = Array(225, 236, 166, 125);        $key = mt_rand(0, 3);        $backColor = imagecolorallocate($im, $r[$key], $g[$key], $b[$key]);    //背景色(随机)        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色        imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);        imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);        $stringColor = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));        // 干扰        for ($i = 0; $i < 10; $i++) {            imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $stringColor);        }        for ($i = 0; $i < 25; $i++) {            imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $stringColor);        }        for ($i = 0; $i < $length; $i++) {            imagestring($im, 5, $i * 10 + 5, mt_rand(1, 8), $randval{$i}, $stringColor);        }        Image::output($im, $type);    }    // 中文验证码    static function GBVerify($length=4, $type='png', $width=180, $height=50, $fontface='simhei.ttf', $verifyName='verify') {        import('ORG.Util.String');        $code = String::randString($length, 4);        $width = ($length * 45) > $width ? $length * 45 : $width;        session($verifyName, md5($code));        $im = imagecreatetruecolor($width, $height);        $borderColor = imagecolorallocate($im, 100, 100, 100);                    //边框色        $bkcolor = imagecolorallocate($im, 250, 250, 250);        imagefill($im, 0, 0, $bkcolor);        @imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);        // 干扰        for ($i = 0; $i < 15; $i++) {            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));            imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $fontcolor);        }        for ($i = 0; $i < 255; $i++) {            $fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));            imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $fontcolor);        }        if (!is_file($fontface)) {            $fontface = dirname(__FILE__) . "/" . $fontface;        }        for ($i = 0; $i < $length; $i++) {            $fontcolor = imagecolorallocate($im, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120)); //这样保证随机出来的颜色较深。            $codex = String::msubstr($code, $i, 1);            imagettftext($im, mt_rand(16, 20), mt_rand(-60, 60), 40 * $i + 20, mt_rand(30, 35), $fontcolor, $fontface, $codex);        }        Image::output($im, $type);    }    /**     * 把图像转换成字符显示     * @static     * @access public     * @param string $image  要显示的图像     * @param string $type  图像类型,默认自动获取     * @return string     */    static function showASCIIImg($image, $string='', $type='') {        $info = Image::getImageInfo($image);        if ($info !== false) {            $type = empty($type) ? $info['type'] : $type;            unset($info);            // 载入原图            $createFun = 'ImageCreateFrom' . ($type == 'jpg' ? 'jpeg' : $type);            $im = $createFun($image);            $dx = imagesx($im);            $dy = imagesy($im);            $i = 0;            $out = '<span style="padding:0px;margin:0;line-height:100%;font-size:1px;">';            set_time_limit(0);            for ($y = 0; $y < $dy; $y++) {                for ($x = 0; $x < $dx; $x++) {                    $col = imagecolorat($im, $x, $y);                    $rgb = imagecolorsforindex($im, $col);                    $str = empty($string) ? '*' : $string[$i++];                    $out .= sprintf('<span style="margin:0px;color:#%02x%02x%02x">' . $str . '</span>', $rgb['red'], $rgb['green'], $rgb['blue']);                }                $out .= "<br>\n";            }            $out .= '</span>';            imagedestroy($im);            return $out;        }        return false;    }    /**     * 生成UPC-A条形码     * @static     * @param string $type 图像格式     * @param string $type 图像格式     * @param string $lw  单元宽度     * @param string $hi   条码高度     * @return string     */    static function UPCA($code, $type='png', $lw=2, $hi=100) {        static $Lencode = array('0001101', '0011001', '0010011', '0111101', '0100011',    '0110001', '0101111', '0111011', '0110111', '0001011');        static $Rencode = array('1110010', '1100110', '1101100', '1000010', '1011100',    '1001110', '1010000', '1000100', '1001000', '1110100');        $ends = '101';        $center = '01010';        /* UPC-A Must be 11 digits, we compute the checksum. */        if (strlen($code) != 11) {            die("UPC-A Must be 11 digits.");        }        /* Compute the EAN-13 Checksum digit */        $ncode = '0' . $code;        $even = 0;        $odd = 0;        for ($x = 0; $x < 12; $x++) {            if ($x % 2) {                $odd += $ncode[$x];            } else {                $even += $ncode[$x];            }        }        $code.= ( 10 - (($odd * 3 + $even) % 10)) % 10;        /* Create the bar encoding using a binary string */        $bars = $ends;        $bars.=$Lencode[$code[0]];        for ($x = 1; $x < 6; $x++) {            $bars.=$Lencode[$code[$x]];        }        $bars.=$center;        for ($x = 6; $x < 12; $x++) {            $bars.=$Rencode[$code[$x]];        }        $bars.=$ends;        /* Generate the Barcode Image */        if ($type != 'gif' && function_exists('imagecreatetruecolor')) {            $im = imagecreatetruecolor($lw * 95 + 30, $hi + 30);        } else {            $im = imagecreate($lw * 95 + 30, $hi + 30);        }        $fg = ImageColorAllocate($im, 0, 0, 0);        $bg = ImageColorAllocate($im, 255, 255, 255);        ImageFilledRectangle($im, 0, 0, $lw * 95 + 30, $hi + 30, $bg);        $shift = 10;        for ($x = 0; $x < strlen($bars); $x++) {            if (($x < 10) || ($x >= 45 && $x < 50) || ($x >= 85)) {                $sh = 10;            } else {                $sh = 0;            }            if ($bars[$x] == '1') {                $color = $fg;            } else {                $color = $bg;            }            ImageFilledRectangle($im, ($x * $lw) + 15, 5, ($x + 1) * $lw + 14, $hi + 5 + $sh, $color);        }        /* Add the Human Readable Label */        ImageString($im, 4, 5, $hi - 5, $code[0], $fg);        for ($x = 0; $x < 5; $x++) {            ImageString($im, 5, $lw * (13 + $x * 6) + 15, $hi + 5, $code[$x + 1], $fg);            ImageString($im, 5, $lw * (53 + $x * 6) + 15, $hi + 5, $code[$x + 6], $fg);        }        ImageString($im, 4, $lw * 95 + 17, $hi - 5, $code[11], $fg);        /* Output the Header and Content. */        Image::output($im, $type);    }    static function output($im, $type='png', $filename='') {        header("Content-type: image/" . $type);        $ImageFun = 'image' . $type;        if (empty($filename)) {            $ImageFun($im);        } else {            $ImageFun($im, $filename);        }        imagedestroy($im);    }}


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