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Paint.NET is a proprietary freeware raster graphics editor program for Microsoft Windows, developed on the .NET Framework. Paint.NET was originally created by Rick Brewster as a Washington State University student project,[4] and has evolved from a simple replacement for the Microsoft Paint program into a powerful editor with support for layers, blending, transparency, and plugins.Contents [hide]
1 Overview
2 History
2.1 Notable releases
3 Plugins
4 Support for non-Windows operating systems
5 See also
6 References
7 Further reading
8 External links

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Overview

Paint.NET is primarily programmed in the C# programming language. Its native image format, .PDN, is a compressed representation of the application's internal object format, which preserves layering and other information.[5] Excluding the installer, text, and graphics, Paint.NET was released under a modified version of the MIT License.[6] It was initially released as completely open source, but due to breaches of license, all resource files (such as interface text and icons) were released under a Creative Commons license forbidding modification, and the installer was made closed-source.[7]

Version 3.36 was initially released as partial open source, but the sources were later removed by Brewster, citing problems with plagiarism. In version 3.5, the license was altered to reflect this, and users are now prohibited from modifying the software. As free licenses cannot be revoked, developers can still legally develop forks based on version 3.36 and earlier. However, unlike most proprietary software licenses, the new license allows users to decompile and reverse engineer the software, provided that no modifications are made.

Brewster later stated that he hopes to release portions of the source code back into the public.
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History

Paint.NET originated as a computer science senior design project during spring 2004 at Washington State University. Version 1.0 consisted of 36,000 lines of code and was written in fifteen weeks.[8] In contrast, version 3.35 has approximately 162,000 lines of code. The Paint.NET project continued over the summer and into the fall 2004 semester for both the version 1.1 and 2.0 releases.

Development continues with one developer who now works at Microsoft and worked on previous versions of Paint.NET while he was a student at WSU. As of May 2006 the program had been downloaded at least 2 million times,[9] at a rate of about 180,000 per month.[10]