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Device CMY (Long Form)
The long form for the Device CMY color space (value field is
18) provides explicit entry of black and white references
(range is –32767 to 32767). Black and white references are
used in the direct pixel encoding modes (2,3) to set relative
limits for raster data; they are also used when specifying
the primary components of new palette entries (?*v#A,
?*v#B, ?*v#C). Black and white references have no effect
on the default CID palette colors. The reference values are
specified as 16-bit signed integers (sint16).
Note The short form for the Device CMY color space defaults
each primary’s white reference to 0 and black reference to
2
n
–1, where n is the number of bits for that primary.
Byte 15 (msb) 8 7 (lsb) 0 Byte
0 Color space Pixel encoding mode 1
2 Bits per index Bits per primary #1 3
4 Bits per primary #2 Bits per primary #3 5
6 White reference for primary #1 (sint16) 7
8 White reference for primary #2 (sint16) 9
10 White reference for primary #3 (sint16) 11
12 Black reference for primary #1 (sint16) 13
14 Black reference for primary #2 (sint16) 15
16 Black reference for primary #3 (sint16) 17
2-18 Using Color Modes2-18 Using Color Modes