www.getpaint.net/doc/latest/RecolorTool.html

The Recolor Tool is used to replace regions of similar color with another color.

www.getpaint.net/doc/latest/GradientTool.html

The Gradient Tool allows the drawing gradients in seven shapes and many formats.

Color gradients are rendered as a transition between the Primary and Secondary colors.

The Gradient Tool also supports a transparency mode which can be use ...

www.keyxl.com/aaad5b6/325/Paint-Dot-Net-keyboard-shortcuts.h...

112 Keyboard Shortcuts for Paint .Net at keyxl.com. The internet's online database for keyboard shortcuts.

www.getpaint.net/doc/latest/WorkingWithLayers.html

paint.net uses "layers" to form a composite image. Imagine layers as a stack of transparent slides. Each slide can contain a separate element which forms part of the overall image. paint.net displays the stack of layers as if it was viewed from above. ...

forums.getpaint.net/index.php?/topic/22849-huge-jpg-files-pa...

I just installed Paint.NET v3.5.10 and realized that the new version produces very big jpg-Files: