Detailed explanation of the steps to create a translucent watermark using the imagecopymerge() function-PHP Tutorial-php.cn

Detailed explanation of the steps to create a translucent watermark using the imagecopymerge() function

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Release： 2023-03-26 21:40:02

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This time I will bring you a detailed explanation of the steps to create a translucent watermark with the imagecopymerge() function. What are the precautions for creating a translucent watermark with the imagecopymerge() function? Here are practical cases, let’s take a look.

<?php
// 加载要加水印的图像
$im = imagecreatefromjpeg(&#39;photo.jpeg&#39;);
// 首先我们从 GD 手动创建水印图像
$stamp = imagecreatetruecolor(100, 70);
imagefilledrectangle($stamp, 0, 0, 99, 69, 0x0000FF);
imagefilledrectangle($stamp, 9, 9, 90, 60, 0xFFFFFF);
imagestring($stamp, 5, 20, 20, &#39;libGD&#39;, 0x0000FF);
imagestring($stamp, 3, 20, 40, &#39;(c) 2007-9&#39;, 0x0000FF);
// 设置水印图像的位置和大小
$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);
// 以 50% 的透明度合并水印和图像
imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 50);
// 将图像保存到文件，并释放内存
imagepng($im, &#39;photo_stamp.png&#39;);
imagedestroy($im);
?>

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Semi-transparent watermark:

This example uses the imagecopymerge() function to merge the watermark image and the original image. We can control the transparency of the watermark, in this case 50% transparency. In actual use, the use of translucent watermarks can protect copyright without affecting users' viewing of images.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!