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This page documents a user-defined function 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.
User defined functions


Takes a hex string (must be 6 char long!) and converts it to a RGB percent set (0.0-1.0)

local function HexToRGBPerc(hex)
	local rhex, ghex, bhex = string.sub(hex, 1, 2), string.sub(hex, 3, 4), string.sub(hex, 5, 6)
	return tonumber(rhex, 16)/255, tonumber(ghex, 16)/255, tonumber(bhex, 16)/255
end

Alternative Version Edit

Takes a hex string (must be 3 or 6 chars long!) and converts it to a RGB percent set (0.0-1.0). If hex is invalid, return black (0,0,0).

local function HexToRGBPerc(hex)
    local rhex, ghex, bhex, base
    if strlen(hex) == 6 then
        rhex, ghex, bhex = strmatch('([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})', hex)
        base = 255
    elseif strlen(hex) == 3 then
        rhex, ghex, bhex = strmatch('([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])', hex)
        base = 16
    end
    if not (rhex and ghex and bhex) then
        return 0, 0, 0
    else
        return tonumber(rhex, 16)/base, tonumber(ghex, 16)/base, tonumber(bhex, 16)/base
    end
end
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