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Prior to reading through this thread I'd never thought much about editing my pictures beyond cropping them if necessary. But all the tips and info in here got me playing around with my images and I'm hooked now!
I selected one picture from my Maui trip and edited it using three different programs, Irfanview, Picasa, and Photoscape. I mostly just used the auto-fix functionality of each program with maybe a little fine tuning. I'm sure with practice I might develop a better eye and be able to make even better adjustments but it is pretty dramatic how much the color can be brought back with the auto-fix option.
Of course starting with a better picture will help too, that's definitely going to take some practice!
Original
Photoscape
Picasa
Irfanview
Very nice, is that GC?