Well, members of ranchers.net, what do you think?
If we change, edit, etc. too much, we have more or less 'touched up' the original picture. Personally, I don't think that is the idea, but I will leave it up to you. Perhaps we should vote on it?
This is a photo contest, not necessarily for those with the knowledge to 'touch up' their photos. I think it would give an undue advantage for those more knowledgeable in computers.
As I type this, my reaction is to say, NO, not fair to work over the original photos. But I sure don't know it all. So lets see what others have to say.