I need some help with clearing some pixels on a paint picture?

I have the same problem. So far I have not found any way to undo it, but I realize I should have saved it in .BMP instead of .JPG :(

So if it's too late and you have no back up picture, you can't do anything except do it the hard way.

info: BMP pictures do not scour or deform as you save the picture. But the file size is bigger than when you save it using other extensions.

JPG only requires small memory, but it does not save in detail. So the more you save, the less "concise" the picture will be.

JPG is a compressed image.

If you have the options of changing the compression value, as some imaging programs allow, then set the compression level to a lower level. This will make the memory size of the image bigger though.