quanti
v1.0.8
Published
Quanti the [color quantization](https://en.wikipedia.org/wiki/Color_quantization) library
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Quanti
Quanti the color quantization library
| Original | Quantized to 8 colors | | ------------------------------- | ------------------------------------------ | | | |
Example with Jimp
const Jimp = require("jimp");
const quanti = require("quanti");
(async () => {
const image = await Jimp.read("./image/sample.png");
const data = image.bitmap.data;
const palette = quanti(data, 8, 4);
palette.ditherProcess(data, image.getWidth());
await image.writeAsync("./image/sample_quantized.png");
})();
Reference
// ArrayLike = Array<number>, Uint8Array, any other number indexed object with length
function quanti(
pixels: ArrayLike<number>, // total pixels that are considered
colorCount: number, // output palette size
channelCount: number // 3 if RGB, 4 if RGBA, >=5 unsupported
): quanti.Palette;
namespace quanti {
class Palette {
palette: ArrayLike<number>[];
constructor(palette: ArrayLike<number>[]);
mapIndex(color: ArrayLike<number>, offset: number = 0): number; // mapping one color to the palette index
map(color: ArrayLike<number>, offset: number = 0): ArrayLike<number>; // mapping one color
process(data: WritableArrayLike<number>): void; // mapping pixels data
ditherProcess(data: WritableArrayLike<number>, width: number): void; // mapping pixels data with dithering
}
function srgb_to_linear(n: number): number;
function linear_to_srgb(n: number): number;
}