Texture pack question

Hello, I'm creating my first resource pack and there's two things I want to do: monochrome grass/shrubbery and leaves that are different colors. I got the grass to be grayscaled and the leaves only are the colors I want them to be but they still have that green of the original leaves mixed in. Is there any way I can fix this? I tried doing the colormaps and made them all white but that didn't fix anything since that's what one video suggested. Any help would be appreciated.