CODEWITHSUNDEEP
pythoncolors
BioGeek
BioGeek

Reputation: 22827

How to programmatically create N sequential equidistant colors ranging from dark to light

I want to create a gradient of N distinct colors ranging from a dark color to a light color, all visually equidistant apart.

Similar like in this answer but for Python instead of R (can only use standard lib though, not eg. numpy).

I'd like a function where I can give as arguments the dark color, e.g. RGB(103,0,13), and the light color, e.g. RGB(255,245,240), and the number of shades. Similar like the output from ColorBrewer (but there I can't define the two end colors and I am limited to maximum 9 shades).

enter image description here

edit: What I tried so far: convert the RGB values to HLS using colorsys.rgb_to_hls(r, g, b) and interpolating the Hue between the dark and the light colors.

Upvotes: 1

Views: 949

Answers (1)

Brionius
Brionius

Reputation: 14098

Here's one way. Note, however, that the example gradient you posted above is a non-linear gradient of some kind. The function below generates linear gradients.

def generateColorGradient(RGB1, RGB2, n):
    dRGB = [float(x2-x1)/(n-1) for x1, x2 in zip(RGB1, RGB2)]
    gradient = [tuple([int(x+k*dx) for x, dx in zip(RGB1, dRGB)]) for k in range(n)]
    return gradient

print generateColorGradient((103,0,13), (255,245,240), 9)

# OUTPUT
# [(103, 0, 13), (122, 30, 41), (141, 61, 69), (160, 91, 98), (179, 122, 126), (198, 153, 154), (217, 183, 183), (236, 214, 211), (255, 245, 240)]

Upvotes: 2

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