給圖片加水印是php程序中一個常用的並且很實用的功能,下面我來給大家詳細介紹php中png透明背景水印程序代碼吧。 代碼如下 復制代碼
//原始圖像
$dst = "/upload/20120914/20120914040740-0.jpg"; //注意圖片路徑要正確
//得到原始圖片信息
$dst_info = getimagesize($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("不支持的文件類型1");exit;
}
//水印圖像
$src = "/images/shuiyin.png"; //注意路徑要寫對
$src_info = getimagesize($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("不支持的文件類型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]);
//保存圖片
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,$dst);break;
default:
die("不支持的文件類型2");exit;
}
imagedestroy($dst_im);
imagedestroy($src_im);
給一個標准的圖片水印類
在網上找的水印代碼:
/*
* 功能:PHP圖片水印 (水印支持圖片或文字)
* 參數:
* $product_img 背景圖片,即需要加水印的圖片,暫只支持GIF,JPG,PNG格式;
* $waterPos 水印位置,有10種狀態,0為隨機位置;
* 1為頂端居左,2為頂端居中,3為頂端居右;
* 4為中部居左,5為中部居中,6為中部居右;
* 7為底端居左,8為底端居中,9為底端居右;
* $waterImage 圖片水印,即作為水印的圖片,暫只支持GIF,JPG,PNG格式;
* $waterText 文字水印,即把文字作為為水印,支持ASCII碼,不支持中文;
* $textFont 文字大小,值為1、2、3、4或5,默認為5;
* $textColor 文字顏色,值為十六進制顏色值,默認為#FF0000(紅色);
*
* 注意:Support GD 2.0,Support FreeType、GIF Read、GIF Create、JPG 、PNG
* $waterImage 和 $waterText 最好不要同時使用,選其中之一即可,優先使用 $waterImage。
* 當$waterImage有效時,參數$waterString、$stringFont、$stringColor均不生效。
* 加水印後的圖片的文件名和 $product_img 一樣。
* 作者:longware @ 2004-11-3 14:15:13
*/
function imageWaterMark
($product_img,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000")
{
$isWaterImage = FALSE;
$formatMsg = "暫不支持該文件格式,請用圖片處理軟件將圖片轉換為GIF、JPG、PNG格式。";
//讀取水印文件
if(!empty($waterImage) && file_exists($waterImage))
{
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w = $water_info[0];//取得水印圖片的寬
$water_h = $water_info[1];//取得水印圖片的高
switch($water_info[2])//取得水印圖片的格式
{
case 1water_im = imagecreatefromgif($waterImage);break;
case 2water_im = imagecreatefromjpeg($waterImage);break;
case 3water_im = imagecreatefrompng($waterImage);break;
default:die($formatMsg);
}
}
//讀取背景圖片
if(!empty($product_img) && file_exists($product_img))
{
$ground_info = getimagesize($product_img);
$ground_w = $ground_info[0];//取得背景圖片的寬
$ground_h = $ground_info[1];//取得背景圖片的高
switch($ground_info[2])//取得背景圖片的格式
{
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($formatMsg);
}
}
else
{
die("需要加水印的圖片不存在!");
}
//水印位置
if($isWaterImage)//圖片水印
{
$w = $water_w;
$h = $water_h;
$label = "圖片的";
}
else//文字水印
{
$temp = imagettfbbox(ceil($textFont*2.5),0,"arial.ttf",$waterText);//取得使用 TrueType 字體的文
本的范圍
$w = $temp[2] - $temp[6];
$h = $temp[3] - $temp[7];
unset($temp);
$label = "文字區域";
}
if( ($ground_w<$w) || ($ground_h<$h) )
{
echo "需要加水印的圖片的長度或寬度比水印".$label."還小,無法生成水印!";
return;
}
switch($waterPos)
{
case 0://隨機
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
case 1://1為頂端居左
$posX = 0;
$posY = 0;
break;
case 2://2為頂端居中
$posX = ($ground_w - $w) / 2;
$posY = 0;
break;
case 3://3為頂端居右
$posX = $ground_w - $w;
$posY = 0;
break;
case 4://4為中部居左
$posX = 0;
$posY = ($ground_h - $h) / 2;
break;
case 5://5為中部居中
$posX = ($ground_w - $w) / 2;
$posY = ($ground_h - $h) / 2;
break;
case 6://6為中部居右
$posX = $ground_w - $w;
$posY = ($ground_h - $h) / 2;
break;
case 7://7為底端居左
$posX = 0;
$posY = $ground_h - $h;
break;
case 8://8為底端居中
$posX = ($ground_w - $w) / 2;
$posY = $ground_h - $h;
break;
case 9://9為底端居右
$posX = $ground_w - $w;
$posY = $ground_h - $h;
break;
default://隨機
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
}
//設定圖像的混色模式
imagealphablending($ground_im, true);
if($isWaterImage)//圖片水印
{
imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷貝水印到目標文件
}
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("水印文字顏色格式不正確!");
}
imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im,
$R, $G, $B));
}
//生成水印後的圖片
@unlink($product_img);
switch($ground_info[2])//取得背景圖片的格式
{
case 1:imagegif($ground_im,$product_img);break;
case 2:imagejpeg($ground_im,$product_img);break;
case 3:imagepng($ground_im,$product_img);break;
default:die($errorMsg);
}
//釋放內存
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.bkjia.com,5,"#FF0000");
//圖片水印
//$waterImage="images/bz.gif";//水印圖片路徑
//imageWaterMark($uploadfile,0,$waterImage);
echo "<img src="".$uploadfile."" border="0">";
}
else
{
echo "Fail<br>";
}
}