Paint.NET是Windows 平台上的一个图像和照片处理软件,它由华盛顿州立大学的学生开发和维护并由微软公司提供项目指导,早期定位于MSPaint的免费替代软件,现在逐渐发展为一个功能强大且易用的的图像和照片处理软件,支持图层,无限制的历史记录,特效,和许多实用工具,并且开放源代码和完全免费,界面看起来有点像Photoshop.用来开发Paint.NET的语言是C＃，而安装程序和界面整合相关功能所用的开发语言是C++。
Pain. NET由C#编写，在.NET Framework 2.0环境下运行，也就是说除了安装Pain. NET外还需要安装这个。
New for version 3.5 is a revamped UI theme for Windows 7 and Vista users, inspired by Aero and making use of "glass". Other features include reduced memory usage, better stability, and better performance. See the Roadmap page for more details.
系统要求：
·Windows 7 (recommended),
or Windows XP SP3,
or Windows Vista SP1 (SP2 and PlatformUpdate recommended)
·800MHz processor (dual-core recommended)
·512MB of RAM
·1024 x 768 screen resolution
·200+ MB hard drive space
·Optional: 64-bit mode requires a 64-bit CPU and a 64-bit edition of Windows
Paint.NET also depends on Microsoft's .NET Framework 3.5 SP1, which is automatically installed if it isn't already on the system.
下载地址：http://www.dotpdn.com/files/Paint.NET.3.5.8.Install.zip