thinkphp在为图片添加水印不足的处理

thinkphp比较老的框架里面虽然有image扩展类但是方法不全,可以下载最新的thinkphp 把新的image类复制过来....

//图像位置,默认为右下角右对齐        //$posY = $sInfo["height"] - $wInfo["height"];        //$posX = $sInfo["width"] - $wInfo["width"];        //居中        $posY = ($sInfo["height"] - $wInfo["height"])/2;        $posX = ($sInfo["width"] - $wInfo["width"])/2;

这里是image扩展类里面的水印坐标可以根据直接来设定,这里我更改为居中...

以下来源：http://hi.baidu.com/baiping588/item/7373a698734652dc1b49dfb9

thinkphp在为图片加水印的时候。如果水印图片是png图片，透明度处理很不理想，与是做以下处理

在Image.class.php中新增

static function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct){        $opacity=$pct;        // getting the watermark width        $w = imagesx($src_im);        // getting the watermark height        $h = imagesy($src_im);                     // creating a cut resource        $cut = imagecreatetruecolor($src_w, $src_h);        // copying that section of the background to the cut        imagecopy($cut, $dst_im, 0, 0, $dst_x, $dst_y, $src_w, $src_h);        // inverting the opacity        //$opacity = 100 - $opacity;                     // placing the watermark now        imagecopy($cut, $src_im, 0, 0, $src_x, $src_y, $src_w, $src_h);        imagecopymerge($dst_im, $cut, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $opacity);    }

//生成混合图像(原来系统中的)

imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo['width'], $wInfo['height'], $alpha);

//换成===================================================================

self::imagecopymerge_alpha($sImage, $wImage, $posX, $posY, 0, 0, $wInfo['width'], $wInfo['height'], $alpha);