diff --git a/lua/colors/doom-one/init.lua b/lua/colors/doom-one/init.lua
index 1215506..4b9801e 100644
--- a/lua/colors/doom-one/init.lua
+++ b/lua/colors/doom-one/init.lua
@@ -7,7 +7,7 @@
 
 -- Helpers {{{
 
-require('colors.utils')
+local utils = require('colors.utils')
 
 -- }}}
 
@@ -88,7 +88,7 @@ local yellow = '#ECBE7B'
 local blue = '#51afef'
 local dark_blue = '#2257A0'
 local magenta = '#c678dd'
-local light_magenta = Lighten(magenta, 0.4)
+local light_magenta = utils.Lighten(magenta, 0.4)
 local violet = '#a9a1e1'
 local cyan = '#46D9FF'
 local white = '#efefef'
@@ -102,23 +102,23 @@ local bg_highlighted = '#4A4A45'
 
 local fg = '#bbc2cf'
 local fg_alt = '#5B6268'
-local fg_highlight = Lighten(fg, 0.2)
+local fg_highlight = utils.Lighten(fg, 0.2)
 
-local tag = Mix(blue, cyan, 0.5)
+local tag = utils.Mix(blue, cyan, 0.5)
 
 local diff_info_fg = orange
-local diff_info_bg0 = Mix('#D8EEFD', bg, 0.6)
-local diff_info_bg1 = Mix('#D8EEFD', bg, 0.8)
+local diff_info_bg0 = utils.Mix('#D8EEFD', bg, 0.6)
+local diff_info_bg1 = utils.Mix('#D8EEFD', bg, 0.8)
 
 local diff_add_fg = green
-local diff_add_fg0 = Mix(green, fg, 0.4)
-local diff_add_bg0 = Mix('#506d5b', bg, 0.6)
-local diff_add_bg1 = Mix('#acf2bd', bg, 0.8)
+local diff_add_fg0 = utils.Mix(green, fg, 0.4)
+local diff_add_bg0 = utils.Mix('#506d5b', bg, 0.6)
+local diff_add_bg1 = utils.Mix('#acf2bd', bg, 0.8)
 
 local gh_danger_fg = red
-local gh_danger_fg0 = Mix(red, fg, 0.6)
-local gh_danger_bg0 = Mix('#ffdce0', bg, 0.6)
-local gh_danger_bg1 = Mix('#ffdce0', bg, 0.8)
+local gh_danger_fg0 = utils.Mix(red, fg, 0.6)
+local gh_danger_bg0 = utils.Mix('#ffdce0', bg, 0.6)
+local gh_danger_bg1 = utils.Mix('#ffdce0', bg, 0.8)
 
 if current_bg == 'light' then
 	light_bg = true
@@ -142,36 +142,36 @@ if current_bg == 'light' then
 	blue = '#4078f2'
 	dark_blue = '#a0bcf8'
 	magenta = '#a626a4'
-	light_magenta = Darken(magenta, 0.36)
+	light_magenta = utils.Darken(magenta, 0.36)
 	violet = '#b751b6'
 	cyan = '#0184bc'
 	white = '#efefef'
 
 	bg = '#fafafa'
 	bg_alt = '#f0f0f0'
-	bg_highlight = Darken(bg, 0.2)
+	bg_highlight = utils.Darken(bg, 0.2)
 	bg_popup = bg_alt
 	bg_statusline = bg_popup
 
 	fg = base5
 	fg_alt = base3
-	fg_highlight = Lighten(fg, 0.2)
+	fg_highlight = utils.Lighten(fg, 0.2)
 
-	tag = Mix(blue, cyan, 0.5)
+	tag = utils.Mix(blue, cyan, 0.5)
 
 	diff_info_fg = orange
-	diff_info_bg0 = Mix('#D8EEFD', bg, 0.6)
-	diff_info_bg1 = Mix('#D8EEFD', bg, 0.8)
+	diff_info_bg0 = utils.Mix('#D8EEFD', bg, 0.6)
+	diff_info_bg1 = utils.Mix('#D8EEFD', bg, 0.8)
 
 	diff_add_fg = green
-	diff_add_fg0 = Mix(green, fg, 0.4)
-	diff_add_bg0 = Mix('#506d5b', bg, 0.4)
-	diff_add_bg1 = Mix('#acf2bd', bg, 0.8)
+	diff_add_fg0 = utils.Mix(green, fg, 0.4)
+	diff_add_bg0 = utils.Mix('#506d5b', bg, 0.4)
+	diff_add_bg1 = utils.Mix('#acf2bd', bg, 0.8)
 
 	gh_danger_fg = red
-	gh_danger_fg0 = Mix(red, fg, 0.6)
-	gh_danger_bg0 = Mix('#ffdce0', bg, 0.8)
-	gh_danger_bg1 = Mix('#ffdce0', bg, 0.9)
+	gh_danger_fg0 = utils.Mix(red, fg, 0.6)
+	gh_danger_bg0 = utils.Mix('#ffdce0', bg, 0.8)
+	gh_danger_bg1 = utils.Mix('#ffdce0', bg, 0.9)
 end
 
 if vim.g.doom_one_cursor_coloring then
@@ -195,7 +195,7 @@ local general_ui = {
 	},
 	NormalPopupPrompt = {
 		fg = base7,
-		bg = transparent_bg and 'NONE' or Darken(bg_popup, 0.3),
+		bg = transparent_bg and 'NONE' or utils.Darken(bg_popup, 0.3),
 		gui = 'bold',
 	},
 	NormalPopupSubtle = {
diff --git a/lua/colors/utils/init.lua b/lua/colors/utils/init.lua
index 04669c9..111c0e7 100644
--- a/lua/colors/utils/init.lua
+++ b/lua/colors/utils/init.lua
@@ -2,25 +2,24 @@
 --       COLOR UTILITIES        --
 ---]]------------------------[[---
 
-local vim = vim
+local M = {}
 
 -------------------------------------------------------------------------------
--- Functions:
--- {{{1
+-- Functions {{{
 
 -- Convert RGB to Hex color.
 -- @param r Red value
 -- @param g Green value
 -- @param b Blue value
 -- @return HEX color, e.g. '#1E1E1E'
-function RGB_to_Hex(r, g, b)
+local function RGB_to_Hex(r, g, b)
 	return '#' .. string.format('%02X%02X%02X', r, g, b)
 end
 
 -- Convert Hex to RGB color.
 -- @param color HEX color
 -- @return RGB color, e.g. {30, 30, 30}
-function Hex_to_RGB(color)
+local function Hex_to_RGB(color)
 	color = color:gsub('#', '')
 	return {
 		tonumber('0x' .. string.sub(color, 1, 2)),
@@ -29,106 +28,11 @@ function Hex_to_RGB(color)
 	}
 end
 
--- Convert HUE to RGB
-function Hue_to_RGB(p, q, t)
-	if t < 0 then
-		t = t + 1
-	end
-	if t > 1 then
-		t = t - 1
-	end
-
-	if t < (1.0 / 6) then
-		return (p + (q - p) * 6.0 * t)
-	end
-	if t < (1.0 / 2) then
-		return q
-	end
-	if t < (2.0 / 3) then
-		return (p + (q - p) * 2.0 / 3 - t) * 6.0
-	end
-
-	return p
-end
-
--- Convert HSL to RGB color.
-function HSL_to_RGB(h, s, l)
-	local r = 0
-	local g = 0
-	local b = 0
-	-- achromatic
-	if s == 0.0 then
-		r = l
-		g = l
-		b = l
-	else
-		local q = l < 0.5 and l * (1 + s) or l + s - l * s
-		local p = 2 * l - q
-		r = Hue_to_RGB(p, q, h + 0.33333)
-		g = Hue_to_RGB(p, q, h)
-		b = Hue_to_RGB(p, q, h - 0.33333)
-	end
-
-	return {
-		r * 255.0,
-		g * 255.0,
-		b * 255.0,
-	}
-end
-
--- Convert RGB to HSL color.
--- @param red Red value
--- @param green Green value
--- @param blue Blue value
-function RGB_to_HSL(red, green, blue)
-	local r = red / 255
-	local g = green / 255
-	local b = blue / 255
-	local max = math.max(r, g, b)
-	local min = math.min(r, g, b)
-
-	local h = 0.0
-	local s = 0.0
-	local l = (max + min) / 2
-
-	if max == min then
-		h = 0 -- achromatic
-		s = 0 -- achromatic
-	else
-		local d = max - min
-		s = (l > 0.5 and d / (2 - max - min) or d / (max + min))
-
-		if max == r then
-			h = (g - b) / d + (g < b and 6 or 0)
-		end
-		if max == g then
-			h = (b - r) / d + 2
-		end
-		if max == b then
-			h = (r - g) / d + 4
-		end
-		h = h / 6
-	end
-
-	return { h, s, l }
-end
-
--- 1}}}
+-- }}}
 -------------------------------------------------------------------------------
--- Composed functions:
--- {{{1
+-- Composed functions {{{
 
-function Hex_to_HSL(color)
-	local r, g, b = Hex_to_RGB(color)
-	return RGB_to_HSL(r, g, b)
-end
-
-function HSL_to_Hex(h, s, l)
-	local r, g, b = HSL_to_RGB(h, s, l)
-	return RGB_to_Hex(r, g, b)
-end
-
-function Lighten(color, percentage)
+M.Lighten = function(color, percentage)
 	local amount = percentage == nil and 5.0 or percentage
 
 	if amount < 1.0 then
@@ -153,7 +57,7 @@ function Lighten(color, percentage)
 	return hex
 end
 
-function Darken(color, percentage)
+M.Darken = function(color, percentage)
 	local amount = percentage == nil and 5.0 or percentage
 
 	if amount < 1.0 then
@@ -186,7 +90,7 @@ local function interpolate(start, _end, amount)
 	return start + (diff * amount)
 end
 
-function Mix(first, second, percentage)
+M.Mix = function(first, second, percentage)
 	local amount = percentage == nil and 0.0 or percentage
 
 	local first_rgb = Hex_to_RGB(first)
@@ -198,4 +102,8 @@ function Mix(first, second, percentage)
 
 	return RGB_to_Hex(r, g, b)
 end
--- 1}}}
+-- }}}
+
+return M
+
+-- vim: fdm=marker