• 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.

Сегодня в блоге разработчиков появилась статья A new license for Paint.NET v3.5

Google перевод

•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

* All font variants (Arial vs. Arial Narrow, etc.) are now available with the Text tool in Win7/Vista with DirectWrite.
* Bitmap font types (Courier, Terminal, Fixedsys) are now available with the Text tool in Win7/Vista.
* Fixed some bad kerning with the Text tool at small sizes when antialiasing was turned off, with Win7/Vista + DirectWrite.
* Bilinear and Bicubic resampling for Image->Resize have improved quality, correctness, and performance. Super Sampling also has some performance improvement.
* Improved the rendering quality for the Hue/Saturation adjustment, as originally discussed here: viewtopic.php?f=27&t=23593 . Also made a new icon for it.
* The Move Selected Pixels tool had many subtle (and not-so-subtle :oops:) rendering issues which are now fixed. These were readily apparent when rotating or flipping a selected area.
* Fixed: The Line/Curve tool was applying pixel snapping to the curve nodes, which caused lines to "bend" when using the Shift key to constrain the angle.
* Fixed some extraneous CPU usage related to unnecessary or redundant thumbnail updates.
* Fixed a few dialogs that looked wrong with Aero glass with Remote Desktop or Virtual PC.
* Fixed a nasty memory leak with Flatten followed by Undo.
* Fixed some issues related to effects that took awhile to cancel -- as it turns out, drag-and-drop was enabled at this time, which could easily lead to crashes. Now, a dialog box will be shown when an effect takes "too long" to finish or cancel.
* Some Win7 systems could not detect that .NET 3.5 SP1 was installed, even though it was. A fallback detection function has been added.
* For plugin authors, the Effect class now has a pollable IsCancelRequested property. This can be used to improve responsiveness for expensive OnSetRenderInfo() implementations, which are otherwise non-interruptible.
* For plugin authors, the Surface.FitSurface() method is now multithreaded.

Changes in Paint.NET 3.5:
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.

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.

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.

Please note that the system requirements have been updated. For Windows XP, you must now have Service Pack 3 (SP3) installed; SP2 is no longer supported. For Windows Vista, you must now have Service Pack 1 installed.

* When pasting an image, Paint.NET will be smarter about ensuring it is placed within the area that has been scrolled/zoomed to.
* Improved the performance and quality of the Curves and Hue/Saturation adjustments.
* Some minor improvements to memory usage, which should help out a few scenarios on 32-bit systems.
* Fixed: If a JPEG was loaded that had an embedded ICC profile, and was then saved as an 8-bit or 24-bit PNG, then the resulting file would be corrupt (32-bit PNG worked fine though).
* Fixed: 16-bit TGAs no longer load with the red and blue channels swapped.
* Fixed: Copy-paste from a Remote Desktop session will no longer be 'shifted' by 3 pixels.
* Fixed: Copy-paste from Internet Explorer, Firefox, or Chrome should preserve alpha/transparency.
* Fixed: Copying from Paint.NET and pasting into Windows Live Writer should now work.
* Fixed: Taking a full-screen screenshot with Print Screen on a multimonitor system, where those monitors don't form a simple rectangle, will now fill the 'gap area' with transparent instead of black. (Example: two monitors of the same size, one of which is rotated by 90 degrees)
* Fixed: If Paint.NET is opened without specifying an image to open, and then the default image is modified and saved, then Paint.NET will no longer close it upon opening another one. This was causing data loss if that default image had layers, and was then saved in a format that did not support layers (anything other than .PDN).
* Fixed: Some systems were showing 'red X' thumbnails for .PDN files in Windows Explorer, instead of the real thumbnail.
* Fixed: The EXIF "Creation Software" saved along with images is no longer localized. This prevents certain languages from seeing "Paint.NET ????? v3.5.6" in the image properties (metadata).

This update improves reliability of saving, further improves Copy/Paste functionality, and fixes some other miscellaneous bugs.
- Saving an image is now fault-tolerant. If there is an error or crash while saving, the original file will be left alone.
- Worked around a bug in some plugins that are incorrectly using the built-in Gaussian Blur effect. For example, Sharpen+. Now they won’t crash.
- Fixed a bug with Edit->Paste into New Image, where the new image would be 1 pixel too wide or tall, as reported at...
- Fixed a bug with the Rectangle Select tool and Fixed Ratio selection, which would be off by 1 pixel, as reported at...
- When pasting an image from Paint.NET into Paint.NET, it will be a little smarter about where it puts the image. Previously, if the location wasn’t within the viewport, it would be placed at the top-left corner of the viewport. Now it will find the nearest point along the edge of the viewport to place the image.
- The EXIF rotation ("orientation") metadata is now discarded when opening an image, which was causing aggravation with images that could then never be reoriented correctly using Image->Rotate
- The EXIF tags for JPEG thumbnail data are now correctly discarded.
- Fixed a handful of memory leaks.
- Fixed a typo in the Italian translation. In the setup wizard it was referring to "Pain.NET" (woops).

Fixed: Saving to a folder that has been moved or renamed will display an error instead of crashing (regression from 3.5.6)
Fixed: Saving to a Sharepoint site will now work (regression from 3.5.6)
Fixed: Saving to a file that is marked as read only will now give an error instead of crashing (regression from 3.5.6)
Fixed: General reliability and correctness improvements to fault-tolerant saving

Here’s the changes from v3.5.8:

Improved: The "Auto-detect" bit-depth setting for PNG, BMP, and TGA now also determines which bit-depth to use based on which one produces the smallest file size, as well as which ones can save the image without losing fidelity.
Improved: You can now use Ctrl+0 as a shortcut key for View -> Actual Size, in addition to Ctrl+Shift+A and Ctrl+Alt+0.
Fixed: Some text in the DirectDraw Surface (DDS) Save Configuration UI was not being loaded.
Fixed: Some DirectDraw Surface (DDS) files authored with other software (e.g. Unreal 2004) could not be loaded.
Fixed: In some rare circumstances, clicking on the Save button in the toolbar would crash.
Fixed: The Korean translation has been added back in, with the help of Bing machine translation to cover the few remaining strings that were untranslated.
Also, fixes since the 3.5.9 Beta include a few compatibility issues with plugins.

• Fixed: Ctrl+Shift+A now works again as a shortcut for View -> Actual Size (broken in 3.5.9)
• Fixed: Ctrl+0 still works for Vizew -> Actual Size even if 10 or more images are open (broken in 3.5.9, it would switch to the 10th image).

August 17th, 2013

• Fixed: The Gaussian Blur effect was incorrectly calculating alpha values for non-opaque pixels.
• Improved performance of the Sharpen effect by about 25%
• Improved performance of the Median effect by about 30%
• Improved performance of the Fragment effect by about 40%
• Improved performance of the Unfocus effect by about 100%
• Reduced memory usage when many selection manipulation operations are in the history/undo stack (the undo data is now saved to disk)
• The built-in updater now supports upgrading to paint.net 4.0 (when it's available)