fix: Ensure that the visualisations happen on copies of the page image

Signed-off-by: Nikos Livathinos <nli@zurich.ibm.com>

docling/models/layout_model.py

@@ -122,8 +122,8 @@ class LayoutModel(BasePageModel):
         left_clusters = [c for c in clusters if c.label not in exclude_labels]
         right_clusters = [c for c in clusters if c.label in exclude_labels]
         # Create a deep copy of the original image for both sides
-        left_image = copy.deepcopy(page.image)
-        right_image = copy.deepcopy(page.image)
+        left_image = page.image.copy()
+        right_image = page.image.copy()
 
         # Draw clusters on both images
         draw_clusters(left_image, left_clusters, scale_x, scale_y)

docling/models/page_preprocessing_model.py

@@ -90,7 +90,7 @@ class PagePreprocessingModel(BasePageModel):
 
         # DEBUG code:
         def draw_text_boxes(image, cells, show: bool = False):
-            draw = ImageDraw.Draw(image)
+            draw = ImageDraw.Draw(image.copy())
             for c in cells:
                 x0, y0, x1, y1 = (
                     c.to_bounding_box().l,