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---
base_model: hustvl/vitmatte-small-composition-1k
library_name: transformers.js
---
https://huggingface.co/hustvl/vitmatte-small-composition-1k with ONNX weights to be compatible with Transformers.js.
## Usage (Transformers.js)
If you haven't already, you can install the [Transformers.js](https://huggingface.co/docs/transformers.js) JavaScript library from [NPM](https://www.npmjs.com/package/@xenova/transformers) using:
```bash
npm i @xenova/transformers
```
**Example:** Perform image matting with a `VitMatteForImageMatting` model.
```javascript
import { AutoProcessor, VitMatteForImageMatting, RawImage } from '@xenova/transformers';
// Load processor and model
const processor = await AutoProcessor.from_pretrained('Xenova/vitmatte-small-composition-1k');
const model = await VitMatteForImageMatting.from_pretrained('Xenova/vitmatte-small-composition-1k');
// Load image and trimap
const image = await RawImage.fromURL('https://huggingface.co/datasets/Xenova/transformers.js-docs/resolve/main/vitmatte_image.png');
const trimap = await RawImage.fromURL('https://huggingface.co/datasets/Xenova/transformers.js-docs/resolve/main/vitmatte_trimap.png');
// Prepare image + trimap for the model
const inputs = await processor(image, trimap);
// Predict alpha matte
const { alphas } = await model(inputs);
// Tensor {
// dims: [ 1, 1, 640, 960 ],
// type: 'float32',
// size: 614400,
// data: Float32Array(614400) [ 0.9894027709960938, 0.9970508813858032, ... ]
// }
```
You can visualize the alpha matte as follows:
```javascript
import { Tensor, cat } from '@xenova/transformers';
// Visualize predicted alpha matte
const imageTensor = new Tensor(
'uint8',
new Uint8Array(image.data),
[image.height, image.width, image.channels]
).transpose(2, 0, 1);
// Convert float (0-1) alpha matte to uint8 (0-255)
const alphaChannel = alphas
.squeeze(0)
.mul_(255)
.clamp_(0, 255)
.round_()
.to('uint8');
// Concatenate original image with predicted alpha
const imageData = cat([imageTensor, alphaChannel], 0);
// Save output image
const outputImage = RawImage.fromTensor(imageData);
outputImage.save('output.png');
```
Example inputs:
| Image| Trimap |
|--------|--------|
|  |  |
Example outputs:
| Quantized | Unquantized |
|--------|--------|
|  |  |
---
Note: Having a separate repo for ONNX weights is intended to be a temporary solution until WebML gains more traction. If you would like to make your models web-ready, we recommend converting to ONNX using [🤗 Optimum](https://huggingface.co/docs/optimum/index) and structuring your repo like this one (with ONNX weights located in a subfolder named `onnx`). |