Screen ambience saturation with HD mode

I really love to use the screen ambience effect with my setup, and I like to increase the saturation setting to about 15. However, when I use the HD mode of screen ambience which looks a lot less pixelated, the saturation slider has no effect. I get that it does this to make the colors match your screen, but when you are shining leds through a white diffuser, you need that little bit of extra saturation. Is there any way I can make colors more saturated while using HD mode like I can with the other modes?