Quick node script for calculating an even distribution between two given colors.

color-distribution-calculator.js

#!/usr/bin/env node

const dark = process.argv[2];
const light = process.argv[3];
const count = parseInt(process.argv[4], 10) + 1;

const matcher = /#?([\w]{2})([\w]{2})([\w]{2})/;

const darkParsed = matcher.exec(dark);
const darkR = parseInt(darkParsed[1], 16);
const darkG = parseInt(darkParsed[2], 16);
const darkB = parseInt(darkParsed[3], 16);

const lightParsed = matcher.exec(light);
const lightR = parseInt(lightParsed[1], 16);
const lightG = parseInt(lightParsed[2], 16);
const lightB = parseInt(lightParsed[3], 16);

const rInterval = (lightR - darkR) / count;
const gInterval = (lightG - darkG) / count;
const bInterval = (lightB - darkB) / count;

console.log(`(${dark})`);
for (let i = 1; i < count; i++) {
  console.log(`#${Math.round(darkR + rInterval * i).toString(16).toUpperCase()}${Math.round(darkG + gInterval * i).toString(16).toUpperCase()}${Math.round(darkB + bInterval * i).toString(16).toUpperCase()}`);
}
console.log((`(${light})`));