pick-random-colors.py

#!/usr/bin/env python3
import random
from colormath.color_objects import LabColor, sRGBColor
from colormath.color_conversions import convert_color
from colormath.color_diff import delta_e_cie2000

print("<style>body { font-size: 24pt; font-family: monospace; }</style>");

def random_srgb():
    return sRGBColor(
        rgb_r=random.randint(0, 255),
        rgb_g=random.randint(0, 255),
        rgb_b=random.randint(0, 255),
        is_upscaled = True)

def distance(a, b):
    lab_a = convert_color(a, LabColor)
    lab_b = convert_color(b, LabColor)
    return delta_e_cie2000(lab_a, lab_b)

white = sRGBColor(rgb_r=1, rgb_g=1, rgb_b=1)
black = sRGBColor(rgb_r=0, rgb_g=0, rgb_b=0)

def output(c):
    text_color = 'white' if distance(white, c) > distance(black, c) else 'black'
    print("<div style='background-color: {0}; color: {1};'>{0}</div>".format(c.get_rgb_hex(), text_color), flush=True)

colors = [random_srgb()]
output(colors[0])

num_colors = 20
num_candidates = 100
while len(colors) < num_colors:
    candidates = []
    for _ in range(num_candidates):
        candidate = random_srgb()
        min_diff = min(distance(candidate, c) for c in colors)
        candidates.append((candidate, min_diff))
    candidates.sort(key = lambda x: x[1])
    pick = candidates[-1][0]
    output(pick)
    colors.append(pick)