NOTE: Griseo relies on fabulous graphics being enabled in order to function. Please only attempt to use this pack on 1.16 or later.
Griseo is a universally compatible greyscale resource pack, which uses fabulous graphics to transform either vanilla Minecraft, or any resource pack into a monochrome masterpiece.
It does this by using vanilla shaders which are constantly active (fabulous graphics) to adjust the RGB channels of every colour rendered in game. Regardless of what resource pack you're running, it will essentially take the overall drawn output, and balance out the RGB channels of each individual colour to be greyscale.
This pack is a simple addon, but may be updated in the future if there are any notable advancements in vanilla shaders, or if a more advanced technique becomes available.
You can subscribe to my YouTube Channel where I frequently post updates on all of my packs.
