PHP uses the imagecopymerge() function to create a semi-transparent watermark tutorial

This article mainly introduces how PHP uses the imagecopymerge() function to create a translucent watermark. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Use the imagecopymerge() function to create a translucent watermark for your reference. The specific content is as follows

<?php
// 加载要加水印的图像
$im = imagecreatefromjpeg('photo.jpeg');

// 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, 'libGD', 0x0000FF);
imagestring($stamp, 3, 20, 40, '(c) 2007-9', 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($im, 'photo_stamp.png');
imagedestroy($im);

?>

Translucent 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' ability to view images.

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