First of all, I think that it's not a good idea to use a software who is designed for digital photograph post-production, when you are trying to illustrate something. I strongly recommend Illustrator or Inkscape instead of photoshop wich I think is great for other purposes.
This article could be useful to achive the gradien to transparent effect in illustrator.
You may not need to cut out the background. Instead use the entire image as a large background for your site. Here is an article that explains how to use a large background. Hope this helps.
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首先，我认为当你试图说明某些东西时，使用专为数码照片后期制作设计的软件不是一个好主意。我强烈推荐 Illustrator 或 Inkscape，而不是 Photoshop，我认为它们对于其他用途来说非常有用。
本文对于在 illustrator 中实现渐变透明效果很有用。
http://creativetechs.com/tipsblog/transparent-gradients-in-illustrator/
你是否想做一些像我在这个小提琴中勾画的事情？：
http://jsfiddle.net/2vvz3/
如果没有，请告诉我差异在哪里，也许我可以帮助您解决这个问题。
First of all, I think that it's not a good idea to use a software who is designed for digital photograph post-production, when you are trying to illustrate something. I strongly recommend Illustrator or Inkscape instead of photoshop wich I think is great for other purposes.
This article could be useful to achive the gradien to transparent effect in illustrator.
http://creativetechs.com/tipsblog/transparent-gradients-in-illustrator/
Are you trying to do something like what I sketched out in this fiddle?:
http://jsfiddle.net/2vvz3/
If not, let me know where's the diference and mayebe I could help you out with this problem.
您可能不需要剪掉背景。相反，使用整个图像作为您网站的大背景。这是一篇解释如何使用大背景的文章。希望这有帮助。
http://webdesignerwall.com/tutorials/how-to-css-large-background
You may not need to cut out the background. Instead use the entire image as a large background for your site. Here is an article that explains how to use a large background. Hope this helps.
http://webdesignerwall.com/tutorials/how-to-css-large-background