Update app.py

app.py

@@ -214,23 +214,28 @@ def preview_pdf(pdf_path, scale_factor=0.5):
         str: Path to the resized image preview.
     """
     try:
-        doc = fitz.open(pdf_path)  # Open PDF
-        first_page = doc[0]  # Get the first page
-        pix = first_page.get_pixmap()  # Render page to Pixmap (image)
+        doc = fitz.open(pdf_path)  # Open the PDF document
+        first_page = doc[0]  # Extract the first page
+        pix = first_page.get_pixmap()  # Get the pixmap (image) of the page
 
-        # Resize image using scale factor
+        # Resize the image manually using width and height scaling
         new_width = int(pix.width * scale_factor)
         new_height = int(pix.height * scale_factor)
-        resized_pix = fitz.Pixmap(pix, new_width, new_height)
+        resized_pix = fitz.Pixmap(pix, 0)  # Clone the pixmap
+
+        # Manually downscale the image using `fitz.Pixmap` constructor
+        resized_pix = fitz.Pixmap(fitz.csRGB, pix, new_width, new_height)
 
         # Save resized image temporarily
         temp_image_path = os.path.join(tempfile.gettempdir(), "pdf_preview_resized.png")
-        resized_pix.save(temp_image_path)
+        resized_pix.save(temp_image_path)  # Save the resized image
         return temp_image_path
+
     except Exception as e:
         st.error(f"Error generating PDF preview: {e}")
         return None
 
+
 if __name__ == "__main__":
     st.set_page_config(
         page_title="Patent Chat: Google Patents Chat Demo",