cal = SetGammaMethod(cal,gammaMode,[precision])

Set up the gamma correction mode to be used. Options
gammaMode == 0 - search table using linear interpolation via interp1.
gammaMode == 1 - inverse table lookup. Fast but less accurate.
gammaMode == 2 - exhaustive search

If gammaMode == 1, then you may specify the precision of the
inverse table. The default is 1000 levels.

See also RefitCalGamma, CalibrateFitGamma, GamutToSettings

8/4/96 dhb Wrote it.
8/21/97 dhb Update for structure.
3/12/98 dhb Change name to SetGammaCorrectMode
5/26/12 dhb Add real exhaustive search mode (2).

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