Update app.py

app.py

@@ -134,7 +134,7 @@ def decode_batch_predictions(input_image):
     
     img_size=(128, 32)
     input_image = tf.convert_to_tensor(input_image, dtype=tf.uint8)
-    input_image = tf.image.decode_png(input_image, channels=1)
+    input_image = tf.image.decode_image(input_image, channels=1)
     input_image = distortion_free_resize(input_image, img_size)
     input_image = tf.image.convert_image_dtype(input_image, tf.float32)/255.0