First off, thanks to everyone on this site for all the great information! I'm a newbie when it comes to calibrating with anything other than the Video Essentials Basics disk. But with all the great info being shared on this site, I decided to purchase an Eye One LT color meter and give it a more serious effort.
I'm having some issues with getting the gamma settings correct on the projector and wondering if anyone has suggestions.
I used the very informative document written by Kal (Greyscale & Colour Calibration for Dummies) to walk through the process. Really a great document for a beginner to get oriented. As I expected though, a little bit of knowledge can be dangerous
I used the HCFR software, Kal's document, and the Eye One LT meter.
-RS10 set to "Custom 2" setting as a starting point
-Gamma set to 2.4 (based on recommendations I've seen on this site)
-Lamp in Normal' mode
-Lens set at 3 (most light output)
-Elite R100WH1 screen CineWhite material with 1.1 gain
-Ceiling mounted projector (12 feet from the screen to lens)
-Fully light controlled room (no ambient light / walls painted dark matte colour)
I ran through the process several times as outlined in the document.
I was able to get my "delta E" to less than 5 for the 20% grey pattern and less than 2 for 30% through to 100% grey test patterns. From reading the document, this would seem to be excellent results. My delta E for the 10% was 12.2 - not great but not too bad either.
Light output measured at 16.174 ftL using the 100% pattern (I'm disappointed by this - was expecting a lot more than this when using the fully open aperture position). I believe this translates to approx 436 lumens and was really expecting closer to 850 or so with the lens wide open
RGB levels seem to track very close to the reference line so it seemed like I was on the right track.
However, looking at the other graphs in HCFR, the luminance starts to differ significantly above the reference curve starting from the 30% grey test point and increasing substantially up to 100% (i.e. increasing slope above the reference curve). The gamma graph starts at about 2.25 for the 10% pattern and drops off the chart by the time it hits the 90% pattern - i.e. it tracks in a steep downward sloping curve instead of a reasonably straight line.
It seems that getting the grey scale to (x=0.313, y=0.329) for each reference point does not mean your gamma setting stays correct. Actually looks like I've really messed up the gamma at the same time I've got a very accurate grey scale
Any suggestions on how I can get both the grey scale and gamma correct at the same time?
What would be the reason for me getting so much lower light output than referenced in the reviews (maybe the Eye One is not the appropriate device for determining light output)?
My calibrated' settings are:
Gain Red= 0
Gain Green= -22
Gain Blue= -73
Offset Red= 0
Offset Green= 1
Lens Aperture= 3