Re: Video LUT Question
Re: Video LUT Question
- Subject: Re: Video LUT Question
- From: "Bruce J. Lindbloom" <email@hidden>
- Date: Wed, 18 Dec 2002 11:49:55 -0600
David Remington wrote:
>
How do you "Load the video look up tables (VLUTs) with ramps"? I don't
>
recall ever hearing this technique mentioned before.
There are probably many ways of doing this, but here is one that does not
require any extra software. I have a set of six monitor profiles at
<
http://www.brucelindbloom.com/Vcgt.html> which are useful for vcgt testing.
They are named A through F. Profile "C.icc" has a ramp vcgt tag. ColorSync
will load this into your VLUTs for you via:
OS 10.2.2: System Preferences > Displays > Color
OS 9.2.2: Monitors control panel > Color
Then select "C.icc" which causes your VLUTs to be immediately loaded with
ramps. Then select a monitor profile that does not contain a vcgt tag. The
VLUTs will remain unchanged (i.e. they'll still be ramps). I would not
recommend leaving "C.icc" selected -- use it only as a temporary means to
load the VLUTs and then select something else.
If you want to make these ramp VLUTs "stick" to your monitor profile, you
may use Apple's "Profile Gamma Tagger" utility to pull the ramps out of the
VLUT and place them into your monitor profile as a ramped vcgt tag (just
like the one C.icc has). Then, whenever your monitor profile is selected,
the VLUTs get loaded with a ramp (and you won't need to do that C.icc trick
anymore). "Profile Gamma Tagger" may be found on Steve Upton's site at
<
http://www.chromix.com>.
--
Bruce J. Lindbloom
email@hidden
http://www.brucelindbloom.com
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