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* Performance in many areas has been substantially improved, and overall memory usage has also been greatly reduced (especially when more than 1 image is open).
* The user interface has been refreshed with new icons, and visual styling has been enhanced for Aero Glass (Windows 7 / Vista only).
* Upgraded to use the latest .NET Framework 3.5 SP1, which has many built-in performance improvements.
* New effect: Blurs -> Surface Blur, by Ed Harvey
* New effect: Distort -> Dents, by Ed Harvey
* New effect: Distort -> Crystalize, by Ed Harvey
* The font manager for the Text Tool has been completely rewritten, resulting in increased performance and better reliability. On Windows 7, the quality of text is much better as a result of using DirectWrite (this also works on Windows Vista if you have installed DirectX 11).
* The built-in updater now has the ability to download updates in the background, and will wait until you exit Paint.NET to install them. In previous versions, the download happened in the foreground, and you had to wait for the entire process to complete before you could use Paint.NET again..
* Now includes a Russian translation.

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However, the license now states that you cannot modify Paint.NET itself, or create derivative works based on the Paint.NET software (that is, derivative software)
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# New: For Windows 7, added taskbar progress reporting for long running operations (effects, adjustments, Image->Resize, save, install)
# Made some corrections to the French translation
# Running setup with /auto will no longer launch Paint.NET when it's done
# Fixed an issue where Paste into New Image would refuse an image on the clipboard, even if regular Paste would take it
# Fixed a race condition with Edit->Paste and Image->Resize whereby it would take up 100% CPU and take between 1 minute to 1 hour to finish
# Fixed an issues with Copy/Paste where it would leave an extra line of transparent pixels on the left, top, right, and/or bottom edges
# Fixed lag with the paintbrush tool that was being seen on some systems
# Fixed some issues with the paintbrush and eraser tool being misaligned when zoomed in
# Fixed a crash that would happen at (seemingly) random times, such as after drawing with the paintbrush tool, on some systems
# Fixed a minor and obscure rendering glitch with the Move Selected Pixels tool
# Fixed an issue with glass over Remote Desktop or Windows 7 Virtual PC
# Fixed a minor glitch whereby the "Unsaved Changes" confirmation dialog could never finish rendering the image thumbnail if one of the Move tools was active

This update resolves some feature disparities in the Text tool between GDI (XP) and DirectWrite (Win7/Vista).
It also improves overall performance, as well as the correctness and quality of the Move Selected Pixels tool, the Image->Resize function, and the Hue/Saturation adjustment.

* Fixed DirectDraw Surface (.dds) file format support for CPUs which do not have SSE2 (Pentium III, Athlon XP).
* Fixed an issue with the File->Save dialog related to file type plugins that were only written for opening (importing).
* Fixed some crashes which were supposed to be "out of memory" errors.
* Fixed a race condition with the New Image, Canvas Size, and Resize dialogs. If you typed extremely fast you could cause a crash by typing a negative number and immediately pressing OK or Enter.
* Fixed a File->Save dialog issue in Win7/Vista where it could ask you about overwriting the wrong file.

This update fixes a few small bugs, and improves performance of the Flatten command.

* Improved performance of the Image->Flatten command by making it multithreaded.
* Fixed the File->Save As dialog not opening to the correct folder.
* Fixed a crash with certain plugins and their use of the File Open dialog.
* Fixed a very rare crash with the toolbar's font list.

Paint.NET v3.5.5 - Download, released on April 25th, 2010
This update fixes a bug when saving 8-bit images, improves layer composition and Gaussian Blur performance, and is now updated to support the new .NET Framework 4.0 in some cases.

* Fixed the bug where saving as 8-bit PNG/GIF/BMP wasn't always working, usually with larger images.
* Improved the performance of the Gaussian Blur effect by 30-40%.
* Improved the performance of all the layer blending modes by 15-30%.
* Improved the performance of zooming with the mouse wheel on dual-core Intel Atom systems.
* Updated to support .NET 4.0 if no other version of .NET is installed.
* Reduced download size from 4.8MB down to 3.5MB.
* Fixed a small error in the Chinese translation.

Paint.NET Megalo Effects Plugin Pack
* Version 16
* Over 490 Effects

und

Paint.NET Megalo FileType Plugin Pack
* Version 9
* 53 FileTypes