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Byte 3 (Number of Bits for Primary #1)
This byte is ignored in pixel encoding modes 0 and 1, but
affects the black and white references in device-dependent
color spaces. In Device RGB, the black reference for
primary #1 is set to 0 and the white reference is set to
2
n
– 1, where n is the number of bits for primary #1. These
references are reversed in Device CMY color space.
In pixel encoding mode 2, this byte is ignored except in
Device RGB and Device CMY color space, where it
designates the number of data bits needed to specify
primary #1, as well as the number of data planes to be
sent for primary #1.
In pixel encoding mode 3, this byte designates the
number of data bits needed to specify primary #1.
A value of 0 defaults the black and white reference values
for primary #1 according to the color space.
Byte 4 (Number of Bits for Primary #2)
This byte is ignored in pixel encoding modes 0 and 1, but
affects the black and white references in device-dependent
color spaces. In Device RGB, the black reference for
primary #2 is set to 0, and the white reference is set to
2
n
– 1, where n is the number of bits for primary #2. These
references are reversed in Device CMY color space.
In pixel encoding mode 2, this byte is ignored except in
Device RGB and Device CMY color spaces, where it
designates the number of data bits needed to specify
primary #2, as well as the number of data planes to be
sent for primary #2.
In pixel encoding mode 3, this byte designates the
number of data bits needed to specify primary #2.
A value of 0 defaults the black and white reference values
for primary #2 according to the color space.
Using Color Modes 2-13Using Color Modes 2-13