Update app.py

app.py

@@ -23,6 +23,10 @@ def initialize_client(api_key=None):
 def encode_image(image_path, max_size=(800, 800), quality=85):
     with Image.open(image_path) as img:
         img.thumbnail(max_size)
+        if img.mode in ('RGBA', 'LA'):
+            background = Image.new(img.mode[:-1], img.size, (255, 255, 255))
+            background.paste(img, mask=img.split()[-1])
+            img = background
         buffered = io.BytesIO()
         img.save(buffered, format="JPEG", quality=quality)
         return base64.b64encode(buffered.getvalue()).decode('utf-8')