@4bitlabs/color v3.0.0

@4bitlabs/color

A collection color manipulation functions and predefined palettes for working with EGA/CGA images.

Palettes

Predefined Palettes

Using your own Palette

const customPalette = Uint32Array.of(
  //AA-BB-GG-RR
  0xff_1f_1f_1f, // color 0
  /*        ...           */
  /* snip 14 more entries */
  /*        ...           */
  0xff_e0_e0_e0, // color 15
);

Predefined Dither Pairs

Generating your own Dither Pairs

import { generateSciDitherPairs, Mixers } from '@4bitlabs/color';

const pairs = generateSciDitherPairs(customPalette, Mixers.softMixer());

IBM 5153 Contrast Knob

import { IBM5153Contrast } from '@4bitlabs/color';

// Simulate turning the constrast knob on a IBM-5153 to about 50%
const palette = IBM5153Contrast(Palettes.CGA_PALETTE, 0.5);

Simulating Grayscale

const grays = toGrayscale(Palettes.CGA_PALETTE);