[PeterS]

I'm going to "try" to give Jim at Lumagen a call tomorrow, but thought I'd post here for some advice first, as I may not be able to call for the information.


Familiar with calibrating for linear gamma within a few projectors, but am confused in the Lumagen. Using CalMAN, which is new to me (vs. HFCR - which I dabbled with).


I've brought the RGB into balance, but can not seem to understand the best procedure for adjusting gamma - which controls/pattern should I use? What should be my gamma target (2.2)?


Any advice would be appreciated.

 

[jrp]

For the Radiance, you would first take "precalibration" measuments. Then use the "Gamma Factor" in our output configuration memory as a course setting for the desired gamma. Then use the 11-point or 21-point parametric gray-scale "Luma" values to adjust at each level to match the values as calculated by the Accupel calculator or your color probe software.


Look at our Radiance Tech-Tip #2 for some information on this. It is at:

http://www.lumagen.com/testindex.php?module=manuals


As to what gamma to use, this can actually vary by program type and the quality of your display/projector. Digital flat panels seem to come from the factory with a gamma of 1.9, or so, to mask their dark area noise by rising out of black faster than a Gamma of 2.2 would. I would suggest avoiding gamma values higher than 2.2 with these displays. For good quality DLP/DILA projectors you may want to have several gamma curves programmed. Perhaps you might choose 2.0 for sports, 2.2 for TV, and 2.4 (or even slightly higher) for movies in a darkened room. Personal taste is definitely a factor in what you choose. Using our Gamma-Factor control to try different gammas for different material is a good way to see which you prefer.


Specific questions can be directed to us at 503-574-2211 or by email to [email protected]