identify whether a colour is warm/cool/neutral

colour_scheme.py

# Shades of white
COLOUR_COLOUR_GHOST_WHITE 		= ("Ghost White", "F8F8FF")
COLOUR_SNOW 				= ("Snow","FFFAFA")
COLOUR_IVORY 				= ("Ivory","FFFFF0")
COLOUR_SEASHELL 			= ("Seashell","FFF5EE")
COLOUR_CORNSILK 			= ("Cornsilk","FFF8DC")
COLOUR_OLD_LACE 			= ("Old Lace","FDF5E6")
COLOUR_CREAM 				= ("Cream","FFFDD0")
COLOUR_BEIGE 				= ("Beige","F5F5DC")
COLOUR_LINEN 				= ("Linen","FAF0E6")
COLOUR_ANTIQUE_WHITE 			= ("Antique White","FAEBD7")
COLOUR_CHAMPAGNE 			= ("Champagne", "F7E7CE")
COLOUR_EGGSHELL 			= ("Eggshell", "F0EAD6")
COLOUR_BONE 				= ("Bone","E3DAC9")
COLOUR_VANILLA 				= ("Vanilla","F3E5AB")
COLOUR_NAVAJO_WHITE 			= ("Navajo White","FFDEAD")
COLOUR_ECRU 				= ("Ecru","C2B280")

# Sades of black
COLOUR_MIDNIGHT_BLUE 			= ("Midnight blue","191970")
COLOUR_DIM_GRAY				= ("Dim gray","696969")
COLOUR_EBONY 				= ("Ebony","555D50")
COLOUR_TAUPE 				= ("Taupe","483C32")
COLOUR_DAVYS_GRAY 			= ("Davy's gray","555555")
COLOUR_CHARCOAL 			= ("Charcoal","36454F")
COLOUR_OUTER_SPACE 			= ("Outer space","414A4C")
COLOUR_CAFE_NOIR 			= ("Cafe Noir","4B3621")
COLOUR_BLACK_BEAN 			= ("Black Bean","3D0C02")
COLOUR_BLACK_OLIVE 			= ("Black Olive","3B3C36")
COLOUR_ONYX 				= ("Onyx","353839")
COLOUR_PHTHALO_GREEN 			= ("Phthalo Green","123524")
COLOUR_JET 				= ("Jet","343434")
COLOUR_BLACK_LEATHER_JACKET 		= ("Black Leather Jacket","253529")
COLOUR_LICORICE 			= ("Licorice","1A1110")

SHADES_WHITE = (
	COLOUR_COLOUR_GHOST_WHITE,
	COLOUR_SNOW,
	COLOUR_IVORY,
	COLOUR_SEASHELL,
	COLOUR_CORNSILK,
	COLOUR_OLD_LACE,
	COLOUR_CREAM,
	COLOUR_BEIGE,
	COLOUR_LINEN,
	COLOUR_ANTIQUE_WHITE,
	COLOUR_CHAMPAGNE,
	COLOUR_EGGSHELL,
	COLOUR_BONE,
	COLOUR_VANILLA,
	COLOUR_NAVAJO_WHITE,
	COLOUR_ECRU,
)

SHADES_BLACK = (
	COLOUR_MIDNIGHT_BLUE,
	COLOUR_DIM_GRAY,
	COLOUR_EBONY,
	COLOUR_TAUPE,
	COLOUR_DAVYS_GRAY,
	COLOUR_CHARCOAL,
	COLOUR_OUTER_SPACE,
	COLOUR_CAFE_NOIR,
	COLOUR_BLACK_BEAN,
	COLOUR_BLACK_OLIVE,
	COLOUR_ONYX,
	COLOUR_PHTHALO_GREEN,
	COLOUR_JET,
	COLOUR_BLACK_LEATHER_JACKET,
	COLOUR_LICORICE,
)

class ColourScheme:

	value = None

	def __init__(self, colour_hex_code):
		self.value = colour_hex_code.lstrip('#')

	def is_neutral (self):
		r, g, b = self.hex_to_rgb (self.value)

		if r == g == b:
			# Shade of grey
			return True

		for name, hex_code in SHADES_BLACK:
			if self.value == hex_code:
				return True

		for name, hex_code in SHADES_WHITE:
			if self.value == hex_code:
				return True

		return False

	def is_warm (self):
		red, green, blue = self.hex_to_rgb (self.value)
		return ( red > blue and not self.is_neutral() )

	def is_cool (self):
		red, green, blue = self.hex_to_rgb (self.value)
		return ( blue > red and not self.is_neutral() )

	def hex_to_rgb(self, value):
		lv = len(value)
		return tuple(int(value[i:i+lv/3], 16) for i in range(0, lv, lv/3))

	def rgb_to_hex(self, rgb):
		return '#%02x%02x%02x' % rgb