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Viewing
Illuminant
Printed colors undergo a hue shift when viewed under
different illuminations (for example, fluorescent, tungsten,
or daylight). Colors with spectral characteristics outside the
range of an illumination source are not received, changing
the appearance of mixed colors. The Viewing Illuminant
command (?*i#W) supports communication of standard
illuminations to the printer to allow the printer to
compensate for different lighting conditions when
appearance matching.
Viewing Illuminant
Command
The Viewing Illuminant command specifies the relative
white point used in the determination of a viewing
illuminant condition.
?*i#W[binary data]
# = Number of binary bytes of data
Default = 8
Range = 8 (command is ignored for invalid
values; signs in the value field are ignored
The binary data field is formatted as follows:
Byte 15 (msb) 8 7 (lsb) 0 Byte
0 x chromaticity white point (lsw) 1
2 x chromaticity white point (msw) 3
4 y chromaticity white point (lsw) 5
6 y chromaticity white point (msw) 7
The above format adheres to the IEEE floating point format
as follows:
31 30 23 22 0
Sign Exponent Fractional Portion
4-16 Modifying Output Color4-16 Modifying Output Color