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November 29, 2010 07:57
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Convert values between RGB hex codes and xterm-256 color codes.
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#! /usr/bin/env python | |
""" Convert values between RGB hex codes and xterm-256 color codes. | |
Nice long listing of all 256 colors and their codes. Useful for | |
developing console color themes, or even script output schemes. | |
Resources: | |
* http://en.wikipedia.org/wiki/8-bit_color | |
* http://en.wikipedia.org/wiki/ANSI_escape_code | |
* /usr/share/X11/rgb.txt | |
I'm not sure where this script was inspired from. I think I must have | |
written it from scratch, though it's been several years now. | |
""" | |
__author__ = 'Micah Elliott http://MicahElliott.com' | |
__version__ = '0.1' | |
__copyright__ = 'Copyright (C) 2011 Micah Elliott. All rights reserved.' | |
__license__ = 'WTFPL http://sam.zoy.org/wtfpl/' | |
#--------------------------------------------------------------------- | |
import sys, re | |
CLUT = [ # color look-up table | |
# 8-bit, RGB hex | |
# Primary 3-bit (8 colors). Unique representation! | |
('00', '000000'), | |
('01', '800000'), | |
('02', '008000'), | |
('03', '808000'), | |
('04', '000080'), | |
('05', '800080'), | |
('06', '008080'), | |
('07', 'c0c0c0'), | |
# Equivalent "bright" versions of original 8 colors. | |
('08', '808080'), | |
('09', 'ff0000'), | |
('10', '00ff00'), | |
('11', 'ffff00'), | |
('12', '0000ff'), | |
('13', 'ff00ff'), | |
('14', '00ffff'), | |
('15', 'ffffff'), | |
# Strictly ascending. | |
('16', '000000'), | |
('17', '00005f'), | |
('18', '000087'), | |
('19', '0000af'), | |
('20', '0000d7'), | |
('21', '0000ff'), | |
('22', '005f00'), | |
('23', '005f5f'), | |
('24', '005f87'), | |
('25', '005faf'), | |
('26', '005fd7'), | |
('27', '005fff'), | |
('28', '008700'), | |
('29', '00875f'), | |
('30', '008787'), | |
('31', '0087af'), | |
('32', '0087d7'), | |
('33', '0087ff'), | |
('34', '00af00'), | |
('35', '00af5f'), | |
('36', '00af87'), | |
('37', '00afaf'), | |
('38', '00afd7'), | |
('39', '00afff'), | |
('40', '00d700'), | |
('41', '00d75f'), | |
('42', '00d787'), | |
('43', '00d7af'), | |
('44', '00d7d7'), | |
('45', '00d7ff'), | |
('46', '00ff00'), | |
('47', '00ff5f'), | |
('48', '00ff87'), | |
('49', '00ffaf'), | |
('50', '00ffd7'), | |
('51', '00ffff'), | |
('52', '5f0000'), | |
('53', '5f005f'), | |
('54', '5f0087'), | |
('55', '5f00af'), | |
('56', '5f00d7'), | |
('57', '5f00ff'), | |
('58', '5f5f00'), | |
('59', '5f5f5f'), | |
('60', '5f5f87'), | |
('61', '5f5faf'), | |
('62', '5f5fd7'), | |
('63', '5f5fff'), | |
('64', '5f8700'), | |
('65', '5f875f'), | |
('66', '5f8787'), | |
('67', '5f87af'), | |
('68', '5f87d7'), | |
('69', '5f87ff'), | |
('70', '5faf00'), | |
('71', '5faf5f'), | |
('72', '5faf87'), | |
('73', '5fafaf'), | |
('74', '5fafd7'), | |
('75', '5fafff'), | |
('76', '5fd700'), | |
('77', '5fd75f'), | |
('78', '5fd787'), | |
('79', '5fd7af'), | |
('80', '5fd7d7'), | |
('81', '5fd7ff'), | |
('82', '5fff00'), | |
('83', '5fff5f'), | |
('84', '5fff87'), | |
('85', '5fffaf'), | |
('86', '5fffd7'), | |
('87', '5fffff'), | |
('88', '870000'), | |
('89', '87005f'), | |
('90', '870087'), | |
('91', '8700af'), | |
('92', '8700d7'), | |
('93', '8700ff'), | |
('94', '875f00'), | |
('95', '875f5f'), | |
('96', '875f87'), | |
('97', '875faf'), | |
('98', '875fd7'), | |
('99', '875fff'), | |
('100', '878700'), | |
('101', '87875f'), | |
('102', '878787'), | |
('103', '8787af'), | |
('104', '8787d7'), | |
('105', '8787ff'), | |
('106', '87af00'), | |
('107', '87af5f'), | |
('108', '87af87'), | |
('109', '87afaf'), | |
('110', '87afd7'), | |
('111', '87afff'), | |
('112', '87d700'), | |
('113', '87d75f'), | |
('114', '87d787'), | |
('115', '87d7af'), | |
('116', '87d7d7'), | |
('117', '87d7ff'), | |
('118', '87ff00'), | |
('119', '87ff5f'), | |
('120', '87ff87'), | |
('121', '87ffaf'), | |
('122', '87ffd7'), | |
('123', '87ffff'), | |
('124', 'af0000'), | |
('125', 'af005f'), | |
('126', 'af0087'), | |
('127', 'af00af'), | |
('128', 'af00d7'), | |
('129', 'af00ff'), | |
('130', 'af5f00'), | |
('131', 'af5f5f'), | |
('132', 'af5f87'), | |
('133', 'af5faf'), | |
('134', 'af5fd7'), | |
('135', 'af5fff'), | |
('136', 'af8700'), | |
('137', 'af875f'), | |
('138', 'af8787'), | |
('139', 'af87af'), | |
('140', 'af87d7'), | |
('141', 'af87ff'), | |
('142', 'afaf00'), | |
('143', 'afaf5f'), | |
('144', 'afaf87'), | |
('145', 'afafaf'), | |
('146', 'afafd7'), | |
('147', 'afafff'), | |
('148', 'afd700'), | |
('149', 'afd75f'), | |
('150', 'afd787'), | |
('151', 'afd7af'), | |
('152', 'afd7d7'), | |
('153', 'afd7ff'), | |
('154', 'afff00'), | |
('155', 'afff5f'), | |
('156', 'afff87'), | |
('157', 'afffaf'), | |
('158', 'afffd7'), | |
('159', 'afffff'), | |
('160', 'd70000'), | |
('161', 'd7005f'), | |
('162', 'd70087'), | |
('163', 'd700af'), | |
('164', 'd700d7'), | |
('165', 'd700ff'), | |
('166', 'd75f00'), | |
('167', 'd75f5f'), | |
('168', 'd75f87'), | |
('169', 'd75faf'), | |
('170', 'd75fd7'), | |
('171', 'd75fff'), | |
('172', 'd78700'), | |
('173', 'd7875f'), | |
('174', 'd78787'), | |
('175', 'd787af'), | |
('176', 'd787d7'), | |
('177', 'd787ff'), | |
('178', 'd7af00'), | |
('179', 'd7af5f'), | |
('180', 'd7af87'), | |
('181', 'd7afaf'), | |
('182', 'd7afd7'), | |
('183', 'd7afff'), | |
('184', 'd7d700'), | |
('185', 'd7d75f'), | |
('186', 'd7d787'), | |
('187', 'd7d7af'), | |
('188', 'd7d7d7'), | |
('189', 'd7d7ff'), | |
('190', 'd7ff00'), | |
('191', 'd7ff5f'), | |
('192', 'd7ff87'), | |
('193', 'd7ffaf'), | |
('194', 'd7ffd7'), | |
('195', 'd7ffff'), | |
('196', 'ff0000'), | |
('197', 'ff005f'), | |
('198', 'ff0087'), | |
('199', 'ff00af'), | |
('200', 'ff00d7'), | |
('201', 'ff00ff'), | |
('202', 'ff5f00'), | |
('203', 'ff5f5f'), | |
('204', 'ff5f87'), | |
('205', 'ff5faf'), | |
('206', 'ff5fd7'), | |
('207', 'ff5fff'), | |
('208', 'ff8700'), | |
('209', 'ff875f'), | |
('210', 'ff8787'), | |
('211', 'ff87af'), | |
('212', 'ff87d7'), | |
('213', 'ff87ff'), | |
('214', 'ffaf00'), | |
('215', 'ffaf5f'), | |
('216', 'ffaf87'), | |
('217', 'ffafaf'), | |
('218', 'ffafd7'), | |
('219', 'ffafff'), | |
('220', 'ffd700'), | |
('221', 'ffd75f'), | |
('222', 'ffd787'), | |
('223', 'ffd7af'), | |
('224', 'ffd7d7'), | |
('225', 'ffd7ff'), | |
('226', 'ffff00'), | |
('227', 'ffff5f'), | |
('228', 'ffff87'), | |
('229', 'ffffaf'), | |
('230', 'ffffd7'), | |
('231', 'ffffff'), | |
# Gray-scale range. | |
('232', '080808'), | |
('233', '121212'), | |
('234', '1c1c1c'), | |
('235', '262626'), | |
('236', '303030'), | |
('237', '3a3a3a'), | |
('238', '444444'), | |
('239', '4e4e4e'), | |
('240', '585858'), | |
('241', '626262'), | |
('242', '6c6c6c'), | |
('243', '767676'), | |
('244', '808080'), | |
('245', '8a8a8a'), | |
('246', '949494'), | |
('247', '9e9e9e'), | |
('248', 'a8a8a8'), | |
('249', 'b2b2b2'), | |
('250', 'bcbcbc'), | |
('251', 'c6c6c6'), | |
('252', 'd0d0d0'), | |
('253', 'dadada'), | |
('254', 'e4e4e4'), | |
('255', 'eeeeee'), | |
] | |
def _str2hex(hexstr): | |
return int(hexstr, 16) | |
def _strip_hash(rgb): | |
# Strip leading `#` if exists. | |
if rgb.startswith('#'): | |
rgb = rgb.lstrip('#') | |
return rgb | |
def _create_dicts(): | |
short2rgb_dict = dict(CLUT) | |
rgb2short_dict = {} | |
for k, v in short2rgb_dict.items(): | |
rgb2short_dict[v] = k | |
return rgb2short_dict, short2rgb_dict | |
def short2rgb(short): | |
return SHORT2RGB_DICT[short] | |
def print_all(): | |
""" Print all 256 xterm color codes. | |
""" | |
for short, rgb in CLUT: | |
sys.stdout.write('\033[48;5;%sm%s:%s' % (short, short, rgb)) | |
sys.stdout.write("\033[0m ") | |
sys.stdout.write('\033[38;5;%sm%s:%s' % (short, short, rgb)) | |
sys.stdout.write("\033[0m\n") | |
print "Printed all codes." | |
print "You can translate a hex or 0-255 code by providing an argument." | |
def rgb2short(rgb): | |
""" Find the closest xterm-256 approximation to the given RGB value. | |
@param rgb: Hex code representing an RGB value, eg, 'abcdef' | |
@returns: String between 0 and 255, compatible with xterm. | |
>>> rgb2short('123456') | |
('23', '005f5f') | |
>>> rgb2short('ffffff') | |
('231', 'ffffff') | |
>>> rgb2short('0DADD6') # vimeo logo | |
('38', '00afd7') | |
""" | |
rgb = _strip_hash(rgb) | |
incs = (0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff) | |
# Break 6-char RGB code into 3 integer vals. | |
parts = [ int(h, 16) for h in re.split(r'(..)(..)(..)', rgb)[1:4] ] | |
res = [] | |
for part in parts: | |
i = 0 | |
while i < len(incs)-1: | |
s, b = incs[i], incs[i+1] # smaller, bigger | |
if s <= part <= b: | |
s1 = abs(s - part) | |
b1 = abs(b - part) | |
if s1 < b1: closest = s | |
else: closest = b | |
res.append(closest) | |
break | |
i += 1 | |
#print '***', res | |
res = ''.join([ ('%02.x' % i) for i in res ]) | |
equiv = RGB2SHORT_DICT[ res ] | |
#print '***', res, equiv | |
return equiv, res | |
RGB2SHORT_DICT, SHORT2RGB_DICT = _create_dicts() | |
#--------------------------------------------------------------------- | |
if __name__ == '__main__': | |
import doctest | |
doctest.testmod() | |
if len(sys.argv) == 1: | |
print_all() | |
raise SystemExit | |
arg = sys.argv[1] | |
if len(arg) < 4 and int(arg) < 256: | |
rgb = short2rgb(arg) | |
sys.stdout.write('xterm color \033[38;5;%sm%s\033[0m -> RGB exact \033[38;5;%sm%s\033[0m' % (arg, arg, arg, rgb)) | |
sys.stdout.write("\033[0m\n") | |
else: | |
short, rgb = rgb2short(arg) | |
sys.stdout.write('RGB %s -> xterm color approx \033[38;5;%sm%s (%s)' % (arg, short, short, rgb)) | |
sys.stdout.write("\033[0m\n") |
buggy script, the 256-color conversion is all wrong
Here's a web UI I made to do this conversion https://hm66hd.csb.app/
this is correct converter, but cannot found source code
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Thanks for that, quite helpful!