https://github.com/donmccurdy/ndarray-lanczos

Resize an ndarray with Lanczos resampling
https://github.com/donmccurdy/ndarray-lanczos

Last synced: about 1 month ago
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Resize an ndarray with Lanczos resampling

• Host: GitHub
• URL: https://github.com/donmccurdy/ndarray-lanczos
• Owner: donmccurdy
• License: mit
• Created: 2021-05-25T03:28:08.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2024-10-07T13:15:11.000Z (about 1 month ago)
• Last Synced: 2024-10-09T07:38:15.807Z (about 1 month ago)
• Language: TypeScript
• Size: 2.05 MB
• Stars: 5
• Watchers: 3
• Forks: 1
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • Funding: .github/FUNDING.yml
  • License: LICENSE

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README

        
# ndarray-lanczos

[![Latest NPM release](https://img.shields.io/npm/v/ndarray-lanczos.svg)](https://www.npmjs.com/package/ndarray-lanczos)

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Resize an [ndarray](https://www.npmjs.com/package/ndarray) with [Lanczos resampling](https://en.wikipedia.org/wiki/Lanczos_resampling).

## Quickstart

Installation:

```

npm install --save ndarray-lanczos

```

Use:

```ts

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'); // → Uint8Array

```

Two filtering methods, `lanczos3` and `lanczos2`, are included.

## Credits

Thanks to https://github.com/rgba-image/lanczos and https://github.com/nodeca/pica.