May 2012
Beginner to intermediate
536 pages
16h 18m
English
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APPENDIX A
Changing Primaries
This appendix describes the operation of transforming one set of primaries into another. The mathematical name for this operation is a change of basis.
To convert a color from one set of primary lights to another, it is first necessary to define a conversion between the primaries themselves. We can think of this as matching each of the new primary lights using the old primary system. Suppose we designate our original set of primaries P1, P2, and P3 and the new set of primaries Q1, Q2, and Q3. We now use our original primaries to create matches with each of the new primaries in turn. Let us call the amount of each of the P primaries cij .
Thus,
(A.1)
If we denote the matrix of cij values C, then
(A.2)
To reverse ...
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