Fixes to preserve page image and demo export to html

Signed-off-by: Maksym Lysak <mly@zurich.ibm.com>

docs/examples/minimal_smol_docling.py

@@ -1,3 +1,5 @@
+from pathlib import Path
+
 from docling.backend.docling_parse_backend import DoclingParseDocumentBackend
 from docling.datamodel.base_models import InputFormat
 from docling.datamodel.pipeline_options import PdfPipelineOptions
@@ -9,19 +11,21 @@ from docling.pipeline.vlm_pipeline import VlmPipeline
 source = "tests/data/2305.03393v1-pg9.pdf"
 
 pipeline_options = PdfPipelineOptions()
+pipeline_options.generate_page_images = True
 pipeline_options.artifacts_path = "model_artifacts"
 
+from docling_core.types.doc import DocItemLabel, ImageRefMode
+from docling_core.types.doc.document import DEFAULT_EXPORT_LABELS
+
 converter = DocumentConverter(
     format_options={
         InputFormat.PDF: PdfFormatOption(
             pipeline_cls=VlmPipeline,
             pipeline_options=pipeline_options,
-            backend=DoclingParseDocumentBackend,
         ),
         InputFormat.IMAGE: PdfFormatOption(
             pipeline_cls=VlmPipeline,
             pipeline_options=pipeline_options,
-            backend=DoclingParseDocumentBackend,
         ),
     }
 )
@@ -33,11 +37,11 @@ print("")
 
 result = converter.convert(source)
 
-print("------------")
-print("result:")
-print("------------")
-print("")
-print(result)
+# print("------------")
+# print("result:")
+# print("------------")
+# print("")
+# print(result)
 
 print("------------")
 print("MD:")
@@ -45,6 +49,13 @@ print("------------")
 print("")
 print(result.document.export_to_markdown())
 
+Path("scratch").mkdir(parents=True, exist_ok=True)
+result.document.save_as_html(
+    filename=Path("scratch/smol_export.html"),
+    image_mode=ImageRefMode.REFERENCED,
+    labels=[*DEFAULT_EXPORT_LABELS, DocItemLabel.FOOTNOTE],
+)
+
 print("")
 print("============")
 print("done!")