how to encode image same as like sam demo?

i am doing like this..but not getting mask

image = cv2.imread(file_location)
predictor.set_image(image)
image_embedding = predictor.get_image_embedding().cpu().numpy().tobytes()
encoded=[base64.b64encode(image_embedding).decode('ascii')]

Compare the reported cv2.imread, predictor.set_image, get_image_embedding, and base64 encoding steps with the SAM demo notebook. Start by checking how the demo represents images and masks, then determine which expected output is missing before defining a fix.

Written by the indexing model from the issue text.