I edit product photos that quite often involve camouflage patterns and multiple colors. I use quick selection, then modify the edges where need be with lasso tools, to remove the background (well, to make a new layer with only the subject).
Problem is, often I hold CTRL when I intended to hold SHFT, and wind up adding to a selection instead of removing, or vice versa. Since these are often complex shapes, I hate to CTRL-Z and lose the alteration.
Is there a way to invert the last selection change? So that if I accidentally subtract a complex shape when I was trying to add it, I can hit one key combo which will take the last selection that was added and instead subtract, and vice versa?
Follow-up: What's the best way to do complex selections? Hitting Q is difficult as the color cast makes things harder to see, and curves seems like it's a lot more work than I'd like. I'm using Photoshop 10/CS3.