Lua function to convert HSL color representation to RGB

hsl2rgb.lua

local function hsl2rgb(h, s, l)
	local r, g, b = nil, nil, nil

	if s == 0 then
		r, g, b = l, l ,l -- achromatic
	else
		local hue2rgb = function(p, q, t)
            if t < 0 then 
            	t = t + 1 
           	end
            if t > 1 then
            	t = t - 1
            end
            if t < 1/6 then
            	return p + (q - p) * 6 * t
            end
            if t < 1/2 then 
            	return q
            end
            if t < 2/3 then 
            	return p + (q - p) * (2/3 - t) * 6
            end
            return p
		end

        local q = nil
        if l < 0.5 then
        	q = l * (1 + s)
    	else 
    		q = l + s - l * s
    	end
        local p = 2 * l - q
        r = hue2rgb(p, q, h + 1/3)
        g = hue2rgb(p, q, h);
        b = hue2rgb(p, q, h - 1/3)
    end

    print("color is: " .. r .. " " .. " " .. g .. " " .. b)

    return r * 255, g * 255, b * 255
end