Update README.md

README.md

@@ -161,9 +161,9 @@ result=model(image)
 result_image = postprocess_image(result[0][0], orig_im_size)
 
 # save result
-pil_im = Image.fromarray(result_image)
-no_bg_image = Image.new("RGBA", pil_im.size, (0,0,0,0))
+pil_mask_im = Image.fromarray(result_image)
 orig_image = Image.open(image_path)
-no_bg_image.paste(orig_image, mask=pil_im)
+no_bg_image = orig_image.copy()
+no_bg_image.putalpha(pil_mask_im)
 ```