Paint.NET is an image editor software designed for Windows Operating Systems. It is not expensive as Photoshop (it is free) and does not have such a messy interfact that is typical for the GIMP and is very kind towards the CPU. The interface of Paint.NEt is similar to the normal MS paint (but the source code was made from scratch) and it is easy to find the tools that one wants to use.
Some of the features of Paint.NET include layers, unlimited undo, blurs, brush sets an dmany other highly useful and highly powerful tools. Other features include a support forum, tutorials, plugins and language packs.
转载一篇文章吧，还有在线的图片处理工具，可以媲美Photoshop！
Sumopaint，一款功能强大、界面酷似Adobe Photoshop的在线图片编辑利器于近日正式上线运营！
Sumopaint 是一款近日刚刚浮出水面、基于 Web 端开发的图片编辑软件，它提供了若干处理图片的基本功能：裁剪、翻转、滤镜、红颜、曝光、蒙版、色调等等等等。可以这么说，你所能想到的一款轻量级图片处理软件所该有的功能，在 Sumopaint 中都能够找到！
