DetermineColor.lua

local function ConvertToHSLColor(Color: Color3)
	local Min = math.min(Color.R*255, Color.G*255, Color.B*255)/255
	local Max = math.max(Color.R*255, Color.G*255, Color.B*255)/255
	local Lightness = (Min + Max)/2

	if Lightness == 0 or Min == Max then
		local Hue = Color:ToHSV()
		return Hue, 0, Lightness
	elseif Lightness > 0 and Lightness <= 0.5 then
		local Hue = Color:ToHSV()
		return Hue, (Max - Min)/(Max + Min), Lightness
	else
		local Hue = Color:ToHSV()
		return Hue, (Max - Min)/(2 - (Max + Min)), Lightness
	end
end

local HUE_LIMITS_FOR_SATURATION_LEVEL_1 =
	{8, 0, 0, 44, 0, 0, 0, 63, 0, 0, 122, 0, 134, 0, 0, 0, 0, 166, 176, 241, 0, 256, 0}

local HUE_LIMITS_FOR_SATURATION_LEVEL_2 =
	{0, 10, 0, 32, 46, 0, 0, 0, 61, 0, 106, 0, 136, 144, 0, 0, 0, 158, 166, 241, 0, 0, 256}

local HUE_LIMITS_FOR_SATURATION_LEVEL_3 =
	{0, 8, 0, 0, 39, 46, 0, 0, 0, 71, 120, 0, 131, 144, 0, 0, 163, 0, 177, 211, 249, 0, 256}

local HUE_LIMITS_FOR_SATURATION_LEVEL_4 =
	{0, 11, 26, 0, 0, 38, 45, 0, 0, 56, 100, 121, 129, 0, 140, 0, 180, 0, 0, 224, 241, 0, 256}

local HUE_LIMITS_FOR_SATURATION_LEVEL_5 =
	{0, 13, 27, 0, 0, 36, 45, 0, 0, 59, 118, 0, 127, 136, 142, 0, 185, 0, 0, 216, 239, 0, 256}

local LUMINOSITY_LIMITS_FOR_HUE_INDEX_LOW = {
	130,
	100,
	115,
	100,
	100,
	100,
	110,
	75,
	100,
	90,
	100,
	100,
	100,
	100,
	80,
	100,
	100,
	100,
	100,
	100,
	100,
	100,
	100,
}

local LUMINOSITY_LIMITS_FOR_HUE_INDEX_HIGH = {
	170,
	170,
	170,
	155,
	170,
	170,
	170,
	170,
	170,
	115,
	170,
	170,
	170,
	170,
	170,
	170,
	170,
	170,
	150,
	150,
	170,
	140,
	165,
}

local COLOR_NAMES_LIGHT = {
	"Coral",
	"Rose",
	"Light Orange",
	"Tan",
	"Tan",
	"Light Yellow",
	"Light Yellow",
	"Tan",
	"Light Green",
	"Lime",
	"Light Green",
	"Light Green",
	"Aqua",
	"Sky Blue",
	"Light Turquoise",
	"Pale Blue",
	"Light Blue",
	"Ice Blue",
	"Periwinkle",
	"Lavender",
	"Pink",
	"Tan",
	"Rose",
}

local COLOR_NAMES_MID = {
	"Coral",
	"Red",
	"Orange",
	"Brown",
	"Tan",
	"Gold",
	"Yellow",
	"Olive Green",
	"Olive Green",
	"Green",
	"Green",
	"Bright Green",
	"Teal",
	"Aqua",
	"Turquoise",
	"Pale Blue",
	"Blue",
	"Blue Gray",
	"Indigo",
	"Purple",
	"Pink",
	"Brown",
	"Red",
}

local COLOR_NAMES_DARK = {
	"Brown",
	"Dark Red",
	"Brown",
	"Brown",
	"Brown",
	"Dark Yellow",
	"Dark Yellow",
	"Brown",
	"Dark Green",
	"Dark Green",
	"Dark Green",
	"Dark Green",
	"Dark Teal",
	"Dark Teal",
	"Dark Teal",
	"Dark Blue",
	"Dark Blue",
	"Blue Gray",
	"Indigo",
	"Dark Purple",
	"Plum",
	"Brown",
	"Dark Red",
}

local function DetermineColor(Color: Color3)
	local Hue, Saturation, Luminosity = ConvertToHSLColor(Color)
	Hue = (if Hue == 0 then 0 else Hue/360)*255
	Saturation *= 255
	Luminosity *= 255

	if Luminosity > 240 then
		return "White"
	elseif Luminosity < 20 then
		return "Black"
	end

	if Saturation <= 20 then
		if Luminosity > 170 then
			return "Light Gray"
		elseif Luminosity > 100 then
			return "Gray"
		else
			return "Dark Gray"
		end
	end

	local HueLimits
	if Saturation > 20 and Saturation <= 75 then
		HueLimits = HUE_LIMITS_FOR_SATURATION_LEVEL_1
	elseif Saturation > 75 and Saturation <= 115 then
		HueLimits = HUE_LIMITS_FOR_SATURATION_LEVEL_2
	elseif Saturation > 115 and Saturation <= 150 then
		HueLimits = HUE_LIMITS_FOR_SATURATION_LEVEL_3
	elseif Saturation > 150 and Saturation <= 240 then
		HueLimits = HUE_LIMITS_FOR_SATURATION_LEVEL_4
	else
		HueLimits = HUE_LIMITS_FOR_SATURATION_LEVEL_5
	end

	local ColorIndex = 0
	for Index = 1, #COLOR_NAMES_MID do
		if Hue < HueLimits[Index] then
			ColorIndex = Index
			break
		end
	end

	if ColorIndex ~= 0 then
		if Luminosity > LUMINOSITY_LIMITS_FOR_HUE_INDEX_HIGH[ColorIndex] then
			return COLOR_NAMES_LIGHT[ColorIndex]
		elseif Luminosity < LUMINOSITY_LIMITS_FOR_HUE_INDEX_LOW[ColorIndex] then
			return COLOR_NAMES_DARK[ColorIndex]
		else
			return COLOR_NAMES_MID[ColorIndex]
		end
	end

	return "Unknown"
end

return DetermineColor