# Alt-Image-Hash

Alternative JavaScript image hashing library.

Supported perceptual hashes:
- `dHash` (difference hash)
- `aHash` (average hash)
- `mHash` (median hash)
- `bHash` (block hash)

### Basic examples

```ts
import {getImageDataWithSharp as getImageData} from "@alttiri/get-image-data";
import {dHash} from "@alttiri/image-hash";

const imagePath = "alyson_hannigan_500x500.jpg";
const imageData = await getImageData(imagePath);
const hash = dHash(imageData);
console.log(hash.hex); // "8f94b43434245452"
```

```ts
const hash1 = dHash(await getImageData("kittens-3264x2448.jpg"));
const hash2 = dHash(await getImageData("kittens-960x720.jpg"));

console.log(hash1.hex); // "e020acce864cae8a"
console.log(hash2.hex); // "e020acce864cae8a"
console.log(hash1.diff(hash2)); // 0
```