HP LP2480zx User Manual page 42

Figure A-4
It can be shown that the required transform (T) may be implemented as a pair of appropriately-sized
look-up tables (LUTs), on either side of a 3 x 3 matrix multiplication. The LUT preceding the matrix
multiplication (the "pre-LUT") implements the desired standard transfer function or gamma response
curve, such that input values are correctly mapped per that standard into a "linear light" space. The
required matrix for the color remapping (which is referred to as R) is a combination of the matrix that
transforms R'G'B' to X'Y'Z' values under the target standard (A
matrix for the existing display device (A
R = A -1 A
D S
This stage must then be followed by a second look-up table (the "post-LUT"), which linearizes the
existing display device; specifically, it contains the inverse of the display's transfer functions γ
The complete transform block (plus the LCD module) as implemented in the LP2480zx monitor is then:
Figure A-5
36 Appendix A Advanced Color Management Features and Usage
Downloaded from ManualMonitor.com Manuals
Correcting Native Display Characteristics
Color Space Conversion Hardware in the LP2480zx
), and the inverse of the corresponding
S
). In other words,
D
.
D(R,G,B)