Just purchased Repper Pro and love it. One quick suggestion: The contrast doesn't seem to change the contrast, it actually seems like it's functioning as a saturation tool. I suppose it could be doing both.
I think separating them into separate saturation and contrast bars would be a lot handier, and would make the software a little more similar to typical imaging programs like Photoshop, etc.
Thanks for your feedback!
I checked the contrast function in Photoshop (CS5) and it seems to be working in roughly the same way as the one in Repper, only with a much smaller range (and thus more subtle). If you select the checkbox "use legacy" it increases the range and the control becomes almost identical to the one in Repper. I believe that contrast is linked to saturation in most cases, like the "curves" function in Photoshop: when you create an S-curve for increased contrast, it will also increase the saturation.
That being said, I still think it's a good idea to have a separate saturation slider and see if we can make the contrast control have less effect on the saturation. We will drop a line here on the forum when we include it in a future update.