Re: Monitor controls: Bias vs Gain
Re: Monitor controls: Bias vs Gain
- Subject: Re: Monitor controls: Bias vs Gain
- From: Roger Breton <email@hidden>
- Date: Mon, 31 Jan 2005 20:29:36 -0500
> I'm profiling a monitor with 6 controls in its color setup window.
> Three Bias controls (RGB) and three Gain controls (RGB). I have
> always left the Bias controls at 50 and adjusted the Gain controls to
> achieve the desired onscreen indicator status but lately have maxed
> out the Red Gain control at 100.
>
> I am wondering if it is OK to adjust the Bias controls if the Gain
> controls alone don't get my visual guidance indicators where they
> need to be? Nothing in my Gretag wizard says otherwise.
> I know I am reaching the end of the screen life when one of the guns
> doesn't measure up, but if I can extend the profile viability by
> doing this, why not?
>
> DaleH
Same thing happened here as I reached the end of my 19" Mitsu CRT life. But
it was nevertheless usable even at that relatively low light level. I don't
mean just ANY low luminance level will do, Hunt says anything below 70 Cd/m2
is not interpreted by the brain as white but as gray. But I would not worry
for so little, until you can get some numerical readout of what the white
calibrated luminance of your screen actually is. 70 is low by all accounts.
80 is the bare minimum. But hey, I once calibrated a client CRT who was
happily turning critical color photography in as low as 60 Cd/m2: he could
not believe his ears when I broke the news to him that his monitor was
finished!
FWIW, the Red gain control on my CRT has long been at 100 and I always
achieved my target white point through the green and the blue gun.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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