如何在PHP中使用已重新采样的图像叠加水印（使用GD）？ [英] How can I overlay a watermark on an already resampled image in PHP (using GD)?

问题描述

这是我当前的代码：

define('IMG_WIDTH',  (isset ($_GET['width']))  ? (int) $_GET['width']  : 99);
define('IMG_HEIGHT', (isset ($_GET['height'])) ? (int) $_GET['height'] : 75);

$image      = imagecreatefromjpeg($_GET['image']);
$origWidth  = imagesx($image);
$origHeight = imagesy($image);

$croppedThumb = imagecreatetruecolor(IMG_WIDTH, IMG_HEIGHT);

if ($origWidth > $origHeight)
{
   $leftOffset = ($origWidth - $origHeight) / 2;
   imagecopyresampled($croppedThumb, $image, 0, 0, $leftOffset, 0, IMG_WIDTH, IMG_HEIGHT, $origHeight, $origHeight);
}
else
{
   $topOffset  = ($origHeight - $origWidth) / 2;
   imagecopyresampled($croppedThumb, $image, 0, 0, 0, $topOffset, IMG_WIDTH, IMG_HEIGHT, $origWidth, $origWidth);
}

它基本上需要一张图片并重新调整尺寸以创建缩略图。它工作得很好。我现在要做的是在右下角添加水印。我已经看到了用于此的 imagecopymerge 函数...但是，这似乎不允许我提供重新采样的图像作为源。

It basically takes an image and re-sizes it to create a thumbnail. It works quite nicely. What I would like to do now is add a watermark to the bottom right corner. I've seen the imagecopymerge function used for this... However, that doesn't seem to allow me to supply a resampled image as the source.

如何拍摄已修改的图像并添加水印？ ：/

How can I take my already modified image and add a watermark? :/

我想过将图像保存到/ tmp然后在我添加水印后取消链接（），但这似乎有点像一团糟...

I've thought of saving the image to /tmp and then unlink()'ing it once I've added the watermark but that seems like a bit of a mess...

推荐答案

您可以使用 $ croppedThumb 作为 imagecopymerge 的第一个参数。您不必先保存图像。

You can use $croppedThumb as the first argument to imagecopymerge. You don't have to save the image first.

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