Appeal No. 2002-1983
Application No. 08/954,826
BACKGROUND
Appellants’ invention is directed to generating a color
conversion table used for converting printing data from a gray
scale color space to the data of a different color space. A pre-
conversion color conversion table stores a corresponding
relationship of the conversion using a small number of lattice
points which are later increased using an interpolation
calculation to form a conversion table.
Representative independent claim 45 is reproduced below:
45. A method of producing a color conversion table adapted
to be used in a printing operation for converting data from a
grey scale color space to print data of a different color space,
comprising:
detecting a reference to said color conversion table as part
of a printing operation;
in response to said reference of said color conversion
table:
accessing, on a non-volatile storage of a computer
system, a predetermined pre-conversion table having a first
number of lattice points and being adapted to convert data
from said grey scale color space to said different color
space using a correspondence relationship; and
using said computer to add a number of additional
lattice points to said pre-conversion table to produce said
color conversion table in a RAM storage region of said
computer, wherein a total number of lattice points in
said color conversion table is greater than said pre-
conversion table but less than a number of lattices
corresponding to a number of gradations of each color, and
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