fix(latex): keep CMYK JPEG figures

docling/backend/latex/handlers/macros.py

@@ -38,6 +38,7 @@
 from docling.backend.latex.utils.encoding import decode_latex_content
 from docling.backend.latex.utils.latex_context import LATEX_CONTEXT_DB
 from docling.backend.latex.utils.text import iter_child_nodelists
+from docling.backend.utils.image import normalize_image_for_png
 
 if TYPE_CHECKING:
     from typing import Any
@@ -374,7 +375,9 @@ def _process_macro(  # noqa: C901
                                 _log.debug(
                                     f"Loaded image {img_path}: {pil_image.size}, DPI={dpi}"
                                 )
-                            image = ImageRef.from_pil(image=pil_image, dpi=int(dpi))
+                            image = ImageRef.from_pil(
+                                image=normalize_image_for_png(pil_image), dpi=int(dpi)
+                            )
                 except Exception as e:
                     _log.debug(f"Could not load image {img_path}: {e}")
 

tests/test_latex/test_figures.py

@@ -119,6 +119,32 @@ def test_latex_includegraphics():
         assert "test_image.png" in picture.captions[0].resolve(doc).text
 
 
+def test_latex_includegraphics_cmyk_jpeg(tmp_path: Path):
+    """A CMYK JPEG figure keeps its image; PNG cannot store CMYK."""
+    from PIL import Image as PILImage
+
+    PILImage.new("CMYK", (100, 50), (0, 255, 255, 0)).save(tmp_path / "fig.jpg")
+    tex_file = tmp_path / "test.tex"
+    tex_file.write_bytes(
+        b"\\documentclass{article}\n\\begin{document}\n"
+        b"\\includegraphics{fig.jpg}\n\\end{document}\n"
+    )
+
+    in_doc = InputDocument(
+        path_or_stream=tex_file,
+        format=InputFormat.LATEX,
+        backend=LatexDocumentBackend,
+        filename="test.tex",
+    )
+    doc = LatexDocumentBackend(in_doc=in_doc, path_or_stream=tex_file).convert()
+
+    assert len(doc.pictures) == 1
+    image = doc.pictures[0].get_image(doc)
+    assert image is not None
+    assert image.mode == "RGB"
+    assert image.getpixel((50, 25)) == (255, 0, 0)
+
+
 def test_latex_includegraphics_missing_image():
     """Test includegraphics gracefully handles missing images"""
     latex_content = b"""