AVS Forum Addicted Member
Join Date: Aug 2002
Location: Markham, Canada
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Screen colour and gain makes quite a difference in final calibration. How grey is grey? How "neutral" is neutral? The colour of the screen affects gamma and colour appearance. Using one set of calibration then projected to (say) Black Diamond, grey screen, matte white, superwhite results in visibly different projected image. Screen also "ages". Vinyl white screens WILL yellow with time which then changes the projected image colour.
Having matte-black ceiling vs regulat white vs beige ceiling, when the projector is mounted very near to the ceiling will cause difference in projected results.
Unfortunately, having auto calibration is not 90% of the battle, it is only the first step of the battle.
Besides, if the calibrator / consumer still have to tweak to get the proper gamma, proper projected colour temperature, overall brogthness etc...that means the projector is NOT doing calibration per industry standard. Then what's the point between having "auto calibration"? It is nothing more than "auto backlight control" and "auto color" on some gimmicky TVs (including Pioneer Kuro's Optimum Mode which includes "Auto White Balance"
What Sony should call it is "Auto Colour Compensator". That is the user should set the calibration RGBCMY points and the projector automatically compensates the RGBCMY points as the bulb and panel ages. Even then, as the bulb ages and panel ages, the gamma calibration will also change and those are NOT compoensated by the circuitry.