php 如何使用PHP将透明PNG与图像合并？
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How to merge transparent PNG with image using PHP?
提问by subZero
The situation is this: I have a small 50x50 pic. I also have a small 50x50 transparent picture which contains a frame for the 50x50 pic, so I basically want to put the transparent png on topof the image and merge those two which would lead to a final third picture that looks something like this: http://img245.imageshack.us/i/50x50n.png
情况是这样的：我有一张 50x50 的小图片。我还有一张 50x50 的小透明图片，其中包含 50x50 图片的框架，所以我基本上想将透明 png放在图像的顶部并将这两个合并，这将导致最后的第三张图片看起来像这样：http ://img245.imageshack.us/i/50x50n.png
Note: I don't want to do this using HTML only (I achieved this by writing a javascript plugin that put the transparent png on top of the original image).
注意：我不想只使用 HTML 来做到这一点（我通过编写一个将透明 png 放在原始图像顶部的 javascript 插件来实现这一点）。
Thanks.
谢谢。
回答by zanbaldwin
You can merge the two images together using the PHP GD2 library.
您可以使用 PHP GD2 库将两个图像合并在一起。
Example:
例子：
<?php
# If you don't know the type of image you are using as your originals.
$image = imagecreatefromstring(file_get_contents($your_original_image));
$frame = imagecreatefromstring(file_get_contents($your_frame_image));
# If you know your originals are of type PNG.
$image = imagecreatefrompng($your_original_image);
$frame = imagecreatefrompng($your_frame_image);
imagecopymerge($image, $frame, 0, 0, 0, 0, 50, 50, 100);
# Save the image to a file
imagepng($image, '/path/to/save/image.png');
# Output straight to the browser.
imagepng($image);
?>
回答by Raf
Add imagealphablending($frame,true);before imagecopymerge()if you want to keep PNG frame transparancy over the image.
如果要在图像上保持 PNG 帧透明度，请在imagealphablending($frame,true);之前添加imagecopymerge()。
回答by Alex Gyoshev
You can do it using ImageMagick :: Composite. The first user contributed note should be enough to grasp the concept.
您可以使用ImageMagick :: Composite来做到这一点。第一个用户贡献的注释应该足以掌握这个概念。
