v1.5.6

Fixed

• Windows builds can again read Deflated Explicit VR Little Endian (zlib-compressed) DICOM SEG files. The 1.5.5 Windows release shipped DCMTK without zlib, so loading any deflated dataset failed with "Unsupported compression or encryption"; DCMTK is now built against the bundled zlib, guarded by a deflate round-trip regression test (#549, @fedorov)

Changed

• Document labelmap segment numbering and background handling: end-user notes for itkimage2segimage/segimage2itkimage covering how Segment Numbers are assigned (--useLabelIDAsSegmentNumber) and how the labelmap background is written and read back (#548, @michaelonken)

Full set of changes