最有效的方法水印图像C＃飞？ [英] Most Efficient Way To Watermark Image C# On The Fly?

问题描述

我都内置了asp.net C＃（Web表单）的电子商务商店和大量新产品的图像是非常困难的来源，所以我想我们的商标或域名水印它们。

I have an ecommerce store built in asp.net c# (Webforms) and a lot of the new product images are very hard to source, so I'd like to watermark them with our logo or domain name.

有太多的产品，只是下载图像，并添加水印，以及用户使用有限的图像编辑经验者上传新的（所以他们不会有线索如何添加水印）。

There are too many products to just download the images and add the watermark, and users with limited image editing experience will be uploading new ones (So they won't have a clue how to add the watermark).

所以我想这只是我留下了使用的HttpHandler？是/否？如果是这样，你可以提供一些见解（preferably $在C＃C $ C示例）到最有效的方法添加水印，考虑的有些网页将有大约20幅图像（JPEG格式）上（所有这一切都需要进行水印）

So I guess this just leaves me with using a HttpHandler? Yes / No? If so can you provide some insight (Preferably code samples in C#) into the most efficient way of adding the watermark, considering some pages will have around 20 images (Jpegs) on (All of which need to be watermarked)

推荐答案

我会得到图形对象为JPEG，然后绘制关于该项目的顶部水印，并与水印重新保存：

I would obtain the Graphicsobject to the jpeg, and then draw the watermark on top of that item, and save it again with the watermark:

using (Image image = Image.FromFile("myImage.jpg"))
using(Graphics g = Graphics.FromImage( image)){
  g.DrawImage( myWaterMarkImage, myPosition);
  image.Save(myFilename);
}

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