Fix: Save PIL Image to temp file before API call

app.py

@@ -28,11 +28,22 @@ def classify_material(image):
         return "Please upload an image", "", ""
 
     try:
+        import tempfile
+        from PIL import Image
+
         print(f"📤 Calling backend API with image type: {type(image)}")
 
+        # Convert PIL Image to temp file for gradio_client
+        if isinstance(image, Image.Image):
+            with tempfile.NamedTemporaryFile(delete=False, suffix='.jpg') as tmp:
+                image.save(tmp.name, 'JPEG')
+                image_path = tmp.name
+        else:
+            image_path = image
+
         # Call protected space API
         client = get_backend()
-        result = client.predict(image=image, api_name="/classify_material")
+        result = client.predict(image=image_path, api_name="/classify_material")
 
         print(f"📥 Backend response: {result}")