Paint.NET（ペイントドットネット）

Version 4.2.9 （2020/01/31）

• Reduced overall memory usage (commit size) by up to 1/3rd by eliminating the per-image scratch buffer
• Greatly improved performance when finishing actions of most tools by employing a shared cache between the render and commit code paths
• Reduced memory usage when working with many tools by consolidating homogenous tiles (those that are comprised of a single color value)
• Significantly improved performance of most history actions (commit, undo, redo) by switching from NTFS compression to multithreaded LZ4 compression for history files
• Significantly improved performance of undo/redo with very complex selections (e.g. from the Magic Wand tool)
• Improved performance of Image -> Flatten (also affects flattening when saving)
• Improved performance of the Invert Colors and Desaturate adjustments by disabling hardware acceleration for them (too much overhead in copying tiles to the GPU for such trivial rendering kernels)
• Improved performance when saving by moving thumbnail rendering for the File -> Open Recent menu to a background thread
• …（省略）

Version 4.2.8 （2019/12/03）

• Fixed: Pinch-to-zoom was not working when using a touch screen (regression in 4.2.6)
• Fixed: Spacebar panning was not working when using a pen/stylus (regression in 4.2.6)
• Fixed: EXIF metadata with non-ASCII characters is now preserved correctly
• Fixed a crash that can happen when the Microsoft Store version of the app is closed for an update
• Added /repair command-line argument, which will run PdnRepair.exe. This makes it easy to use Start -> Run -> paintdotnet:/repair so you don't have to go fishing for the installation directory.

Version 4.2.7 （2019/11/26）

• Fixed a crash at startup (FileLoadException) due to 1) the stub for System.Runtime.dll not being updated, and 2) the rigid version binding policy that prevented the older version from working in its stead (which would've been fine in this case).