1. Is it possible to create a "not-completely-grayscale" colormap? I want the colors of the picture for the duration of the powerup to be toned down. I don't know the correct terms, especially in English: whether it is decreased brightness, or saturation, or something else, so I'll try to describe it: I want the colors kind of "compressed" towards the grayscale, but not all the way, so the bright colors could still be seen, but as dull colors.
2. For the Ring of Invulnerability I tried replacing GoldMap with
so that it only slightly tints the screen yellow. However, the side effect is that it makes the picture slightly brighter, so you can see in the darkness while the Ring is active slightly better than without it. Of course, the increase is less noticeable than the original GoldMap (which essentially makes the Torch redundant for the duration of the Ring), but I still would like to decrease this extra brightness, so that the picture gets tinted yellow, but does not get brighter (if possible, it is even better to make it slightly darker).