Converting Hex to RGB value in Python

Question

Working off Jeremy\'s response here: Converting hex color to RGB and vice-versa I was able to get a python program to convert preset colour hex codes (example #B4FBB8), howe

Answer 1

The following function will convert hex string to rgb values:

def hex_to_rgb(hex_string):
    r_hex = hex_string[1:3]
    g_hex = hex_string[3:5]
    b_hex = hex_string[5:7]
    return int(r_hex, 16), int(g_hex, 16), int(b_hex, 16)

This will convert the hexadecimal_string to decimal number

int(hex_string, 16)

For example:

int('ff', 16) # Gives 255 in integer data type

Answer 2

I believe that this does what you are looking for:

h = input('Enter hex: ').lstrip('#')
print('RGB =', tuple(int(h[i:i+2], 16) for i in (0, 2, 4)))

(The above was written for Python 3)

Sample run:

Enter hex: #B4FBB8
RGB = (180, 251, 184)

Writing to a file

To write to a file with handle fhandle while preserving the formatting:

fhandle.write('RGB = {}'.format( tuple(int(h[i:i+2], 16) for i in (0, 2, 4)) ))

Answer 3

A lazy option: webcolors package has a hex_to_rgb function.

Answer 4

PIL also has this function, in ImageColor.

from PIL import ImageColor

ImageColor.getrgb("#9b9b9b")

And if you want the numbers from 0 to 1

[i/256 for i in ImageColor.getrgb("#9b9b9b")]

Answer 5

You can use ImageColor from Pillow.

>>> from PIL import ImageColor
>>> ImageColor.getcolor("#23a9dd", "RGB")
(35, 169, 221)

Answer 6

All the answers I've seen involve manipulation of a hex string. In my view, I'd prefer to work with encoded integers and RGB triples themselves, not just strings. This has the benefit of not requiring that a color be represented in hexadecimal-- it could be in octal, binary, decimal, what have you.

Converting an RGB triple to an integer is easy.

rgb = (0xc4, 0xfb, 0xa1) # (196, 251, 161)

def rgb2int(r,g,b):
    return (256**2)*r + 256*g + b

c = rgb2int(*rgb) # 12909473
print(hex(c))     # '0xc4fba1'

We need a little more math for the opposite direction. I've lifted the following from my answer to a similar Math exchange question.

c = 0xc4fba1

def int2rgb(n):
    b = n % 256
    g = int( ((n-b)/256) % 256 )      # always an integer
    r = int( ((n-b)/256**2) - g/256 ) # ditto
    return (r,g,b)

print(tuple(map(hex, int2rgb(c)))) # ('0xc4', '0xfb', '0xa1')

With this approach, you can convert to and from strings with ease.