Quote - I'll try thanks

Don't work on the original texture.  Make a copy of it and work on the copy.  This way you will still have the original to fall back on in case you want to use it in the future. 

If you don't want to rename the new texture,  just put a copy of the  original file in another place on your hard drive, and over write the old file. This way you retain the name, but it will be a new texture and you won't have to go into the material room and search for the new texture file name.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi