Update app.py

Update dpi into 200

app.py

@@ -41,7 +41,7 @@ def process_pdfs(pdf_files):
         if not os.path.isfile(pdf_file):
             raise ValueError(f"File {pdf_file} does not exist.")
 
-        images = convert_from_path(pdf_file, dpi=250)  # Convert PDF pages to images
+        images = convert_from_path(pdf_file, dpi=200)  # Convert PDF pages to images
         all_images.extend(images)
 
     return all_images