Re: Optimal black point on a monitor?
Re: Optimal black point on a monitor?
- Subject: Re: Optimal black point on a monitor?
- From: email@hidden
- Date: Sat, 16 Oct 2004 10:08:46 EDT
In a message dated 10/16/04 11:02:44 AM, email@hidden writes:
A friend asked me this question. I did not have an answer so I thought
I would pass it on to this list for more info.
> "I am curious, the theory I have always heard, about the amount of
> black in crt monitor calibrations is that the absolute black of the
> live image area should match the absolute black of the black "dead"
> frame surrounding the live image area. Yet calibrators and software
> invariably do not achieve this, they end up considerably lighter."
What advantage is there for the blacks displayed to be brighter than
the blackest the display can produce?
The goal in setting monitor black, is to not lose any possible contrast, while, at the same time not driving the black below what the monitor can display, as this can have negative results elsewhere in the process, especially if it causes distorted channel curves. I suspect that the ideal of tube mask black is not really achievable on the live monitor area, and that the blacks that monitor calibrators offer are closer to the truth. You can prove this for yourself, but adjusting the brightness control on your monitor all the way up and down, and seeing if there is any point at which the live area matches the mask at the edges; if so, see if this setting also offers appropriate white luminance... you need both. And remember that a clipped black will cause you far more problems than a slightly weak black.
C. David Tobie
Product Technology Manager
ColorVision, Inc.
email@hidden
www.colorvision.com
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