[LVL ED] Black&White screen effect possible?

[TheGreatCthulhu]

The shader file (the program in core/shaders/) should replace the one that came with the game (because that's the only place the game will load it from), there shouldn't be a separate copy in the FC folder.

so I lowered to the gray effect (replacement) and it looks marvelous, but its stil not in GrayScale

Does this mean it's different than normal, just not grayscale, or?
If it is different, maybe you could post a screenshot, it could help figure things out.

Also, if you played around with the files a lot, make sure there wasn't a mixup. The gray replacement gradient effect should have the whole right side completely white. This is especially important for the gray effects, because as the right side gets darker and darker, the shader should revert more and more to the old (original) implementation, where a uniform gray gradient does nothing (so for gray values on the right side, you'd get a mix of the normal image and the grayscale image).
If you by any chance use an image editor (like Photoshop) to maybe darken the gradient, make sure only the left side is changed - for reasons I just mentioned.