Resize an ndarray with Lanczos resampling.
Installation:
npm install --save ndarray-lanczos
Use:
import ndarray from 'ndarray';
import { getPixels, savePixels } from 'ndarray-pixels';
import { lanczos3 } from 'ndarray-lanczos';
// Read PNG.
const srcPixels = await getPixels('full-size.png');
// Resize with Lanczos 3 resampling.
const dstPixels = ndarray(new Uint8Array(width * height * 4).fill(0), [width, height, 4]);
lanczos3(srcPixels, dstPixels);
// Write PNG.
const data = await savePixels(dstPixels, 'image/png'); // → Uint8ArrayTwo filtering methods, lanczos3 and lanczos2, are included.
Thanks to https://github.com/rgba-image/lanczos and https://github.com/nodeca/pica.