Raising saturation without the colors messing up?

[killerteengohan]

I have a source that the colors look very dull or washed out. I was going to increase it slightly by using Tweak(sat=1.05)

I noticed when using this though that on all the blacks or dark colors you can see green spots and or rainbow like colors showing up and moving around on the source. It seems to add a green tint to blacks. When I turn the tweak back off, the colors go back to normal.

This does this even if I raise the saturation even the smallest bit like tweak(sat=1.01) and its very visible and annoying.

Using a derainbow filter doesn't help at all. Is there an alternative method for increasing saturation using avisynth?



Heres screenshots of the issue I'm talking about. This scene isnt as washed out or dull as the other scenes I want to use tweak for but it shows what I'm talking about if you look at the black or darker colors like their shirt.

NO SATURATION INCREASE




WITH TWEAK SAT=1.04




NO SATURATION INCREASE




WITH TWEAK SAT=1.04