Add padding to ensure even LUT

ImagingDataCommons · Apr 12, 2024 · 5d77c95 · 5d77c95
1 parent 081533f
commit 5d77c95
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Showing 2 changed files with 8 additions and 2 deletions.
diff --git a/src/highdicom/content.py b/src/highdicom/content.py
@@ -2413,6 +2413,12 @@ def __init__(
             )
         self._attr_name_prefix = f'{color.title()}PaletteColorLookupTable'
 
+        if bits_per_entry == 8 and len(lut_data) % 2 != 0:
+            # Need to pad so that the resulting value has even length
+            lut_data = np.concatenate(
+                [lut_data, np.array([0], lut_data.dtype)]
+            )
+
         # The Palette Color Lookup Table Data attributes have VR OW
         # (16-bit other words)
         setattr(

diff --git a/src/highdicom/seg/sop.py b/src/highdicom/seg/sop.py
@@ -1729,11 +1729,11 @@ def __init__(
                 lut_end = lut_start + lut_entries
 
                 if (
-                    (lut_start > 1) or lut_end <= len(segment_descriptions)
+                    (lut_start > 0) or lut_end <= len(segment_descriptions)
                 ):
                     raise ValueError(
                         'The labelmap provided does not have entries '
-                        'to cover all segments.'
+                        'to cover all segments and background.'
                     )
 
                 for desc in segment_descriptions: