Message
Re: [colorvision_group] LCOS projector calibration
2008-09-15 by CDTobie@aol.com
In a message dated 9/15/08 1:12:33 PM, james.west@... writes:
Projector is set up for defaults using Canon's sRGB input mode on
the analog input.
That concerns me a bit, is there a mode that isn't sRGB?
Projector driven by our HP laptop's VGA port with
resolution set to 1400 x 1050 using 32-bit color mode.
That part sounds fine...
Using Spyder2Pro we walk through the steps for projector
calibration using gamma setting of 2.2 with native mode white point.
Those settings are correct...
This projector has brightness and contrast controls so we use that
setting. While tweaking the brightness and contrast I do notice that
it seems difficult to obtain a lot of separation in the multiple white
and black boxes in the next couple of calibration screens.
Well, then you may not get good highlight and shadow detail with your projector, but you don't want to make adjustments so extreme that they ruin the rest of your image attempting to chase highlight and shadow detail.
You don't note how you are setting the Spyder up (some people simply refuse to set it a foot from the screen, looking at its own shadow, others forget to remove the baffle, so there are two possible issues) and you don't note how you are displaying images (if its from a non-color managed application, the projector profile simply isn't going to get used). And a last possibility: are you calibrating in the dark? I mean the pitch black? Thats the right way to do it, as screen black is only as dark as the room you are working in. Oh, and one last question: is the software projecting full screen color patches? If its not, for one reason or another, you really can't profile the projector with just a small color patch in the middle of the screen, the way you would with a monitor...
C. David Tobie
WW Product Technology Manager
Digital Imaging & Home Theater
Datacolor
CDTobie@...
www.datacolor.com/Spyder3
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