php中png透明背景水印程序代码
给图片加水印是php程序中一个常用的并且很实用的功能，下面我来给大家详细介绍php中png透明背景水印程序代码吧。
<?php
//原始图像
$dst = "/upload/20120914/20120914040740-0.jpg"; //注意图片路径要正确
//得到原始图片信息
$dst_info = getimagesize($dst);
switch ($dst_info[2]) {
case 1:
$dst_im = imagecreatefromgif($dst);
break;
case 2:
$dst_im = imagecreatefromjpeg($dst);
break;
case 3:
$dst_im = imagecreatefrompng($dst);
break;
case 6:
$dst_im = imagecreatefromwbmp($dst);
break;
default:
die("不支持的文件类型1");
exit;
}
//水印图像
$src = "/images/shuiyin.png"; //注意路径要写对
$src_info = getimagesize($src);
switch ($src_info[2]) {
case 1:
$src_im = imagecreatefromgif($src);
break;
case 2:
$src_im = imagecreatefromjpeg($src);
break;
case 3:
$src_im = imagecreatefrompng($src);
break;
case 6:
$src_im = imagecreatefromwbmp($src);
break;
default:
die("不支持的文件类型1");
exit;
}
//半透明格式水印
//$alpha = 50;//水印透明度
//imagecopymerge($dst_im,$src_im,$dst_info[0]-$src_info[0]-10,$dst_info[1]-$src_info[1]-10,0,0,$src_info[0],$src_info[1],$alpha);
//支持png本身透明度的方式
imagecopy($dst_im, $src_im, $dst_info[0] - $src_info[0] - 10, $dst_info[1] - $src_info[1] - 10, 0, 0, $src_info[0], $src_info[1]);
//保存图片
switch ($dst_info[2]) {
case 1:
imagegif($dst_im, $dst);
break;
case 2:
imagejpeg($dst_im, $dst);
break;
case 3:
imagepng($dst_im, $dst);
break;
case 6:
imagewbmp($dst_im, $dst);
break;
default:
die("不支持的文件类型2");
exit;
}
imagedestroy($dst_im);
imagedestroy($src_im);
?>给一个标准的图片水印类
在网上找的水印代码：
<?php
/*
* 功能：PHP图片水印 (水印支持图片或文字)
* 参数：
* $product_img 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 $product_img 一样。
* 作者：longware @ 2004-11-3 14:15:13
*/
function imageWaterMark($product_img, $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($formatMsg);
}
}
//读取背景图片
if (!empty($product_img) && file_exists($product_img)) {
$ground_info = getimagesize($product_img);
$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:
$ground_im = imagecreatefromgif($product_img);
break;
case 2:
$ground_im = imagecreatefromjpeg($product_img);
break;
case 3:
$ground_im = imagecreatefrompng($product_img);
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 * 2.5) , 0, "arial.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, $B));
}
//生成水印后的图片
@unlink($product_img);
switch ($ground_info[2]) //取得背景图片的格式
{
case 1:
imagegif($ground_im, $product_img);
break;
case 2:
imagejpeg($ground_im, $product_img);
break;
case 3:
imagepng($ground_im, $product_img);
break;
default:
die($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);
}
//---------------------------------------------------------------------------------------
if (isset($_FILES) && !empty($_FILES['userfile']) && $_FILES['userfile']['size'] > 0) {
$uploadfile = "./" . time() . "_" . $_FILES['userfile']['name'];
if (copy($_FILES['userfile']['tmp_name'], $uploadfile)) {
echo "OK<br>";
//文字水印
imageWaterMark($uploadfile, 0, "", 'http://www.phprm.com', 5, "#FF0000");
//图片水印
//$waterImage="images/bz.gif";//水印图片路径
//imageWaterMark($uploadfile,0,$waterImage);
echo "<img src=\"" . $uploadfile . "\" border=\"0\">";
} else {
echo "Fail<br>";
}
}本文链接:http://www.phprm.com/frame/php1005342.html
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