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Color Lookup
Tables
Color lookup tables provide a way to re-map color data for
the following types of applications:
Highlight and shadow modification
Saturation and desaturation
Unique gamma correction curves
Special effects for tonal correction
Neutral balancing
Color lookup tables map input data for each primary color
into a new output range based on point-by-point
conversions. Color lookup tables can modify input data for
both device-dependent and device-independent color spaces.
Like the CID command, the first byte of the data field
identifies the color space to which the lookup tables will be
applied. These tables specify on a point-per-point basis a
transformation from an input space of 0 . . . 255 into an
output space of 0 . . . 255. Figure 4-1 on the next page
illustrates the concept.
The unity lookup table (see the following illustration) is the
default for all color spaces; it performs a 1:1 mapping of
input to output (that is, 129 is mapped to 129). The
inversion lookup table performs a simple color inversion; for
example, it inverts the red primary of a device-dependent
RGB color space to create cyan output (from 255 red to 0
red, which is 255 cyan).
Color Lookup
Tables Command
This command enables and specifies color lookup tables.
?*l#W[binary data]
# = Number of bytes of binary data
Default = 0
Range = 0 or 770 (command is ignored for
other values; sign is ignored)
Modifying Output Color 4-11Modifying Output Color 4-11