Update index.js

index.js

@@ -494,7 +494,7 @@ async function upscaleImage(imageBuffer) {
   return new Promise(async (resolve, reject) => {
       try {
         const upscaler = new Upscaler();
-        const imageTensor = tfjs.tensor3d(new Int8Array(imageBuffer), [imageBuffer.height, imageBuffer.width, 3]);
+        const imageTensor = tfjs.tensor3d(new Uint8Array(imageBuffer), [imageBuffer.height, imageBuffer.width, 3]);
 
         const upscaledTensor = await upscaler.upscale(imageTensor, {
           scale: 4, // upscale by a factor of 4