On the left is the image is it appears inside of Unity’s editor and inside of the game.
On the right is the image as it is on disk, in Gimp and in preview windows.
I re-imported it, changed every setting, filter, mip-map and this is the first sprite I have ever
seen do this, as I currently have several dozen other sprites loaded in the game.
I restarted Unity and recreated and re-saved the image and re-imported it.
Every sprite I import now is doing this.
Now, explain that. 
How can this possibly be my fault?
How can I fix this?
THE ANSWER???
Well, except that’s not the answer at all. The correct thing to do is to turn off compression for sprites that you don’t want compressed, using the import settings. “Compress assets on import” does that specifically: compress assets on import. Compressed assets will still be compressed when making a build, so the issue is merely delayed. (Which is the point of that setting: compression can take a while, so if you’re frequently reimporting assets, it can be faster to only compress them when making a build, instead of every time you import. But they still get compressed eventually.)
–Eric
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