I purchased PhotoGene, but found it doesn't have a full curves implementation. It has a very nice tool for adjusting levels, but it's not as powerful as a full curve.
I've used PhotoCurvesFree in the past, and it is very nice, but it limits the output resolution to something like 1200x1600, which stinks. Even PhotoForge (same company) is limited in resolution. So, unfortunately, something like what I've described that can do full resolution editing doesn't currently exist.
I've used PhotoCurvesFree in the past, and it is very nice, but it limits the output resolution to something like 1200x1600, which stinks. Even PhotoForge (same company) is limited in resolution. So, unfortunately, something like what I've described that can do full resolution editing doesn't currently exist.