Update app.py

app.py

@@ -16,6 +16,7 @@ app = FastAPI()
 engine = RapidOCR()
 
 def pil_to_base64(img: Image.Image) -> str:
+    """Convert PIL image to efficient base64 string."""
     buffered = io.BytesIO()
     img.save(buffered, format="JPEG", quality=70) 
     return base64.b64encode(buffered.getvalue()).decode('utf-8')
@@ -581,4 +582,5 @@ html_content = """
 
     </script>
 </body>
-</html>
+</html>
+"""