Edit the Colour

[KittenKatja]

I can't show the original, as it is NSFW.

[MadJik]

Then do you really need to have the transparency? I mean if your image is always with the same background it is possible to play with the layer and the blend mode to get ride off the pixels...

[KittenKatja]

Are you telling me it's impossible with either paint.NET and plugins?

Because such a feature would be also useful for Construct2 and other frameworks, in which spites HAVE to contain transparency, in order to not look messed up.

[IRON67]

No, MadJik didn't telling "impossible".

After watching this discussion for a while now, it seems to me that you are hoping to get your project done automatically with a minimum of effort.
Such a thing almost never works. You almost always have to manually correct.

To return to your first example with EER's Avatar:
For example, if the background and parts of clothing are almost the same color, it helps to insert a thin line of separation along the back with the line tool.

 

 

Removing pixels at the edge of an object, works with the plugins I already mentioned very well. If necessary, the eraser can also be manually corrected at a sufficiently low hardness.

Edited June 29, 2017 by IRON67

[Seerose]

 @IRON67!  Thank you for your efforts. Very well explained. Thank you so much.