I've been working on calibrating my JVC x-75 projector. First time with a projector so I'm on a learning curve. I'm using the CMS of a Radiance XE with an x-rite display 3 meter. The projector is located in a dedicated HT room which is fully light controlled and has walls that are painted with a very low reflective gray paint.
1. For some reason I cannot get a good reading off the screen (Stewart Studiotek 130 G3). As I understand it the Y value with 100 percent test screen should read between 100 and 200. Even with the meter less than a foot off the screen I get a Y measurement of around 30. I have tried to make sure that the meter is not reading its own shadow. This does not seem right compared to viewing actual material as I have had no problem with the image being too dark. Any suggestions? In any case as a result I have had to calibrate off the lens.
2. I got a good calibration but then learned that I might want to adjust the aperture of the lens rather than leave it fully open. I would have liked to set the aperture based on a reading off the screen but since I couldn't get a decent reading off the screen I had to eyeball it using a scene from a movie. I closed the aperture as far as I could without feeling that the image was too dark.
3. After playing around with the initial picture settings on the projector and turning off as many "special effects" in the projector as possible, I did autocalc and then touched up manually. I got the following results.
These seem pretty good. I got gamma pretty flat at 2.2 as well. Only problems I see are the undersaturation of blue about which I suppose there is not much to be done.
A few questions:
1. I had trouble getting good white balance at 0% but does it really matter? I guess 0% intensity means you can't see it?
2. I noticed that when I was fiddling with white balance at 10 and 20 percent it seemed to affect the readings at other intensity levels. Is that normal? Or is it just explained by variations in the readings from measurement to measurement?
3. After all this I watched Jurassic Park 3D and it didn't look very good for two reasons. One it seemed too dark and two the image consistently lacked a certain sharpness or resolution.
a. I think I probably need to adjust the contrast for 3D but I'm not entirely sure how to do a 3D calibration. One suggestion I've received is to copy the 2D calibration to 3D and then just adjust the contrast with a 3D pluge pattern putting the glasses on the meter. The other is to do a full blown 3D calc but I'm not really sure if that is necessary or exactly how to do it. Any suggestions on this?
b. As for the lack of sharpness or resolution I not sure if the Jurassic Park 3D reissue is just not very good or if there is something else I need to do.
Thanks in advance for any suggestions or comments.