This post is dedicated to those of you who don't believe that the only way to calibrate for 3D is with the ****ter glasses ON. Despite the fact that those are the conditions that everybody
watches 3D in.
First I wanted to comment on 2 points made by some of the guys in the Sharp XV-Z30000 thread."I knew it couldn't be 80% the image looked too bright to be 1/5th the brightness!"
Look at what you do. You take absolute scale (lumens/lux) and compare it in % to your perception. Our perception works in logarithmic scale! 80% in absolute scale isn't equal to 80% in logarithmic scale! For example take loudness. Decibel is a relative (logarithmic) scale. The boost in 3 dB roughly translates to doubling the loudness compared to previous level. You cannot take an absolute scale which lumens/lux is and make an assumption that 1000 lumens is two times brighter than 500 lumens in your eyes. We may further discuss this topic here
."With glasses on the meter is most likely averaging a lot of black frames (shutters closed) which would (in my opinion) hurt the results."
Doing otherwise will hurt the result. Basically you want to disregard time-domain. You need to take all those black frames into account. Do you know the term 'exposure'
? Every shade of gray of different IRE you see with or without the glasses
is the result of exposure, in other words an amount of luminance of a scene in a given time. 3D shutter glasses are liquid crystal based and operate in the 96-144 Hz region. Meters are susceptible to exposure and operate just like our eyes in this regard. If this weren't the case meters would be unable to take measurements from CRT monitors which use narrow electronic beam of very
high light intensity to scan raster to create an image (Look up for videos on YouTube of a CRT monitor in slow motion). My CRT monitor is able to refresh at 160 Hz per second and I'm still able to get constant readings from my meter.
I think it is a well-known fact that shutter glasses operate by alternatively closing left and right eyes to present the picture with the left and right perspective at one time for each eye. While one eye sees the picture the other sees a blacked out shutter glass. This happens 96-144 times per second. In theory we can say that you will see black frame 50% of the time regardless of refresh rate. There are different techniques used by different technologies (DLP/IR/RF) and manufacturers to vary the time that each shutter glass remains in the on state (blacking out the picture). But I have yet to see ones that can preserve more than 60% of brightness for each eye. The brightness loss due to work of shutter glasses alone is no less than 40%. Do an experiment. Walk outside on a blindingly bright day. You're squinting, right? You're trying to reduce the amount of light reaching your brain by closing down eyelids. Now close one eye. Will your other eye still be squinting? No, it will be open to equalize the amount of light coming to your brain!
If this is not enough for you to believe that it is necessary to take readings behind the glasses when they are shuttering, since you
watch a 3D image in such conditions, then I give up.
Shutter glasses 3D is an early technology and I believe some of its limitations (brightness) cannot be fully overcome.
@Zombie I think "Shutter Glasses 3D Calibration Thread" or "Active Glasses 3D Calibration Thread" is better suited to this topic.