php图片加水印原理(超简单的实例代码)
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文字水印:
<div class="codetitle"><a style="CURSOR: pointer" data="6954" class="copybut" id="copybut6954" onclick="doCopy('code6954')"> 代码如下:
<div class="codebody" id="code6954">
$w = 80;
$h = 20;
$im = imagecreatetruecolor($w,$h);
$textcolor = imagecolorallocate($im,123,12,255);
$white = imagecolorallocate($im,255,255);
$grey = imagecolorallocate($im,128,128);
$black = imagecolorallocate($im,0);
imagefilledrectangle($im,399,29,$grey); //画一矩形并填充 // 把字符串写在图像左上角
imagestring($im,3,2,"Hello world!",$textcolor); //
输出图像
header("Content-type: image/jpeg");
imagejpeg($im);
imagedestroy($im);
图片水印 $groundImg = "DSC05940.jpeg";
$groundInfo = getimagesize($groundImg);
$ground_w = $groundInfo[0];
//print_r($groundInfo);
$ground_h = $groundInfo[1];
switch($groundInfo[2]){
case 1:
$ground_im = imagecreatefromgif($groundImg);
break;
case 2:
$ground_im = imagecreatefromjpeg($groundImg);
break;
case 3:
$ground_im = imagecreatefrompng($groundImg);
break;
} $waterImg = "DSC05949.jpeg";
$imgInfo =getimagesize($waterImg);
$water_w = $imgInfo[0];
$water_w = $imgInfo[1]; switch($imgInfo[2]){
case 1:
$water_im = imagecreatefromgif($waterImg);
break;
case 2:
$water_im = imagecreatefromjpeg($waterImg);
break;
case 3:
$water_im = imagecreatefrompng($waterImg);
break;
}
imagecopy($ground_im,$water_im,100,500,500);
header("Content-type: image/jpeg"); imagejpeg($ground_im);
