The problem
Discord Nitro lets you set a profile theme color. Simple enough — except the banner Discord actually shows you isn't the hex you picked. It's blended roughly 40% toward black or white depending on the color's brightness, and there's no documentation on the exact formula and no in-client preview.
So people were doing the obvious thing: pick a color, upload, check, adjust, re-upload, repeat.
Figuring out the blend
I sampled a range of theme colors against their rendered banners and worked backward to the blend ratio and direction (toward black for brighter colors, toward white for darker ones, roughly a 40% mix). Once I had that matched, the rest was just wrapping it in something usable.
