Originally Posted by bobof
I have a new-to-me X3 with a 100hrs V4 lamp in it.
I've been trying to calibrate with Lumagen 2021 / Chromapure3. What I noticed last time I did this is that I powered on the projector, waited an hour, did the white balance adjustment and then launched the autocalibration, that by the time the autocalibration had finished the white point had shifted (less red, maybe 3-4%) and the light output has dropped (maybe as much as 1ftL), and the gamma has changed at the top end.
It is of course very watchable and I can't detect it by eye as being "wrong", but of course it can be measured.
It takes a bit over an hour for two passes of 729 points plus grayscale.
No need to wait an hour for the projector to warm up. I usually give it 20 minutes or so. It is also possible your lamp shifted a bit since it's only at 100hrs. I don't have a RS40 anymore, but I was able to get good 125pt calibrations when I had it. The 40 was always a bit of a fussy projector.
Sounds like you know what you're doing, but never huts to put this out there again..might be one little bit of information that really helps.. ??!!
One trick I found to make sure the autocal will go smooth and quick is to make sure you're getting enough light on the screen. If the light level is too low, it will take forever to do the autocal. Does it hang for long periods of time on red(s) and the darker end of greyscale? If yes, light level is too low..
Let your projector warm up, setup your meter facing the screen, go into the raw data module and display a continuous 100% white pattern. Adjust your meter while watching the FL output (Y). When you see peak output, lock the head of your tripod down. Then adjust the iris until you get at least 14fl off the screen. If you can get 16 or so, that would be better. If you've never done this before, it will seem really, really bright.. Also make sure you set the meter at least 18 inches from the screen.
Using the "reference" patterns in the lumagen, do you manual greyscale adjustments on the projector. You have to use the reference since they bypass any processing and saved CMS adjustments in the processor. Also check your gamma and make adjustments in the projector to get as close to 2.2 as you can..do your other manual adjustments...
When everything looks good, start the autocal. Once you have enough light on the screen, you'll be amazed at how fast the autocal goes and how much better the results are. What you are experiencing is exactly the same problem I had for a while since I was trying to eyeball the light level. When I finally figured it out, slapped my forehead, said "DOH!" and used the meter to set the light level, I was blown away by the results. I'm using CP2 with the same meter and a 2041. Try the above with a two pass, 125pt autocal w/greyscale to start and see if your results are better. Then you're not waiting as long for it to finish. Shouldn't be more than 10 minutes for a 125pt calibration.