Question

我想调整大小并为上传的图片添加水印。我能够成功调整图像大小，但是一旦我应用了水印，水印就会有黑色背景而不是透明。

$watermark_l = "source/watermark_l.png";
$size_wm_l = getimagesize($watermark_l);
$watermark_l = imagecreatefrompng($watermark_l);
$filename = "input/$gallery/$file";
header('Content-Type: image/jpeg');
list($width, $height) = getimagesize($filename);
$x_large = 2000;
$y_large = 1333;
$image_p = imagecreatetruecolor($x_large, $y_large);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $x_large, $y_large, $width, $height);
imagecopy($image_p, $watermark_l, 0, 0, 0, 0, $size_wm_l[0], $size_wm_l[1]);
imagejpeg($image_p, "output/$gallery/2000x1333_$file", 100);

Answer 1

尝试在ImageCreate之后在图像上启用Alpha混合：

ImageAlphaBlending($watermark_l,true);
ImageAlphaBlending($image_p,true);

Answer 2

这是使用PHP在图像上添加水印的一个很好的例子 -

<?php
// Load the stamp and the photo to apply the watermark to
$stamp = imagecreatefrompng('stamp.png');
$im = imagecreatefromjpeg('photo.jpeg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
imagecopy($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));

// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

来源 - http://php.net/manual/en/image.examples-watermark.php

在PHP中调整图像的大小和水印

2 个答案: