How to: Fixing lazily-made masks with Paint.NET

[Wohlstand]

If you don't know what a "lazily-made" sprite is, for an overview read this

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What we all know happens when attempting to use lazily-made masks:


Here I'm going to explain in detail about fixing these lazily-made masks:

example

After opening broken image, I recommend set zoom to large size:


Step 1:
Take "Magic spell" tool, and set selection mode to "Append":


And click to all background areas on image for check them to "selected":


Step 2:
Take brush tool, and set any large size:


Don't forget to set foreground color to White:


And we can paint over background, for fix wrong color of background:


Step 3:
Now, you must invert selection and change foreground to black:


Paint over non-transparent zone by black color:

And image was fixed

Step 4:
Now, you must save image:


Don't forget set both values to 0:


And mask was fixed!
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Sprite-designers, please don't make lazily-made masks next time!
And save files as the real .GIF, not .BMP renamed with the .GIF extension