Update app.py

app.py

@@ -51,7 +51,7 @@ async (aspect) => {
 def process_sketch(canvas_data, binary_matrixes):
   base64_img = canvas_data['image']
   image_data = base64.b64decode(base64_img.split(',')[1])
-  image = Image.open(BytesIO(image_data))
+  image = Image.open(BytesIO(image_data)).convert("RGB")
   im2arr = np.array(image)
   colors = [tuple(map(int, rgb[4:-1].split(','))) for rgb in canvas_data['colors']]
   colors_fixed = []