I am trying to use HCFR and a DTP-94 colorimeter to calibrate my Panasonic PT-AE4000U projector. The PJ is being fed the test patterns from a DVDO iScan VP50Pro scaling hub.
I purchased the DTP-94 (technically an Optix XR that came with a Monaco EZcolor bundle) in 2006 to calibrate my EIZO monitor for processing digital photos. Recently I became curious if it could help calibrate my projector, and discovered that it will, and that it works with HCFR. Although I had previously been satisfied with my PJ's images calibrated by eye, I thought I would give HCFR a go for checking color and gamma accuracy.
After doing a no-light calibration of the probe (properly, I assume), I attached it to a tripod pointing at the screen a few inches away from the 80 IRE pattern. In order to get HCFR to indicate that it is reading 6500K, I have to add a LOT of red contrast in the PJ's picture settings, and subtract quite a bit of green and blue. I have to make similar adjustments to red brightness and green/blue brightness to get a 6500K reading on the 30 IRE screen. (These steps are based on the "getting started with HCFR" instructions at Curt Palme's site.) The resulting screens look nowhere near to a neutral grey, they appear to have too much red.
So I am wondering if my colorimeter has suffered some sort of "drift" since I bought it. My assumption is that the no-light calibration step is designed to compensate for this. However, curtpalme.com indicates that the probes should be periodically sent in for recalibration, so this confuses me. Does this mean they are entering some sort of new calibration matrix into the unit? Is this something a DIYer could do? Is there a simple way to test if the probe is accurately measuring white point?