list of supported PCS connection spaces

    0 - 8-bit ICC CIELAB (100, 0, 0 => 255/255, 128/255, 128/255 = 1, 0.50196, 0.50196)
    0 - 16-bit ICC CIELAB (100, 0, 0 => 65535/65535, 32896/65535, 32896/65535 = 1, 0.50196, 0.50196)
    1 - 16-bit ICC legacy L*a*b* (100, 0, 0 => 65280/65535, 32768/65535, 32768/65535 = 0.99611, 0.50001, 0.50001)
    2 - 16-bit EFI/Monaco L*a*b* (100, 0, 0 => 65535/65535, 32768/65535, 32768/65535 = 1, 0.50001, 0.50001)
    3 - L*a*b* (100, 0, 0 => 100, 0, 0)
    4 - LxLyLz (100, 0, 0 => 100, 100, 100)
    5 - unit LxLyLz (100, 0, 0 => 1, 1, 1)
    6 - xyY (100, 0, 0 => 0.34570, 0.35854, 100)
    7 - 16-bit ICC XYZ (100, 0, 0 => 0.9642 * 32768/65535, 32768/65535, 0.8249 * 32768/65535 = 0.48211, 0.50001, 0.41246)
    8 - 32-bit ICC XYZNumber (100, 0, 0 => 0.9642, 1.0, 0.8249)
    9 - xyz (100, 0, 0 => 1, 1, 1)
    10 - XYZ (100, 0, 0 => 96.42, 100, 82.49)

explanation and application

    option 0 is for both 8-bit and 16-bit CIELAB encoding. it is listed twice to show the equivalence.
    option 1 is the 16-bit L*a*b* encoding from the v2 specification. option 1 also applies to mft2 and ncl2 tags within v4 profiles.
    option 2 is a non-standard L*a*b* encoding used by EFI and Monaco.
    option 3 is standard L*a*b* encoding, used in measurement files and floating point tags (e.g. D2Bx, B2Dx).
    option 4 is L* encoding of the xyz channels.
    option 5 is unit L* encoding of the xyz channels.
    option 6 is chromaticity plus Y.
    option 7 is the 16-bit XYZ encoding used by v2 and v4. 8-bit XYZ encoding is undefined by the ICC specification.
    option 8 is the 32-bit format used by XYZ tags, and the format used to set absolute colorimetry when creating PCS objects.
    option 9 is X/Xn, Y/Yn, Z/Zn, as defined in ISO 13655.
    option 10 is standard XYZ encoding, used in measurement files.