When I click on "Edit Image", Skinstudio opens up paintbrush.  I have been making changes, not realizing that the oroginal transparencies are now all gone!

If I manually try to edit the tga file using different applications such as Paint.NET or Irfanview, when I save the TGA file and reload the skin, the image becomes all white.

What's the trick to reliably keeping existing transparency in an image without jumping through hoops?  I just want to click Edit Image, make simple changes, save... and it will ONLY change what I changed, not the transparency as well.

Thanks in advance!