WoW:USERAPI RGBPercToHex
This page documents a <i>user-defined function</i> that you can copy and paste into your addon. Replace PREFIX with your addon or lib prefix to avoid conflicts between different versions of these functions.
Takes a RGB percent set (0.0-1.0) and converts it to a hex string.
local function RGBPercToHex(r, g, b)
return string.format("%02x%02x%02x", r*255, g*255, b*255)
end