Correctly account for Cr and Cb subsampling when calculating number o…

…f pixels
ImagingDataCommons · Jul 13, 2023 · 95e6b31 · 95e6b31
1 parent b19cea2
commit 95e6b31
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/highdicom/io.py b/src/highdicom/io.py
@@ -492,6 +492,12 @@ def _bytes_per_frame_uncompressed(self) -> int:
             #   are packed into 12.5 -> 13 bytes
             return n_pixels // 8 + (n_pixels % 8 > 0)
         else:
+            if self.metadata.PhotometricInterpretation == 'YBR_FULL_422':
+                # Account for subsampling of CB and CR when calculating
+                # expected number of samples
+                # See https://dicom.nema.org/medical/dicom/current/output/chtml
+                # /part03/sect_C.7.6.3.html#sect_C.7.6.3.1.2
+                n_pixels = self.metadata.Rows * self.metadata.Columns * 2
             return n_pixels * bits_allocated // 8
 
     def close(self) -> None: