Lew Hitchner (hitchner++at++netcom.com)
Thu, 25 Aug 1994 10:55:22 -0700
> I need a way to change the display gamma at Multi-Channel Option.
> "vout" is no solution, as it changes the gamma slope but not the
> function itself, and there are at least two default settings, the
>> exponential (obviously used for general purposes - see GL Programming
> Guide, p.4-24) and the linear one (problably applied, when MCO is run
> - see on-line man pages).
> The use of "gammaramp(r,g,b)" helps manipulate the gamma in an own
> application program, but it has no effect, when MCO is on.
> Does anybody know a solution to this problem?
I cannot answer his question directly, but have some suggestions.
Perhaps an SGI employee will give him a complete answer to his question.
When in a previous job I was using a Video Splitter (a four video channel
predecessor of the MCO) on our 4D/440 IG2 SkyWriter under IRIX 4.0.5, I
ran into bugs in the software for gamma correction. The vs software
supposedly supported gamma correction that allows a user application to
directly load the 256 entry r,g,b compensation table values with any
function desired. However, when I tried using that fn., it didn't work
at all (I think it just set the table to all 1's or all 0's or something
dumb like that). We had full customer support, so I logged a call. I
was assigned to a specialist in video software support. He told me, yes
the fn. didn't work and that it was fixed in the next release of the
VideoSplitter software which was to come out with the next release of
IRIX. I left my old job before that happened, so I don't know what's
happened.
If you have a support contract, here's what you might try. Place a call
and get a call # and give SGI your email address. I don't know how
making the phone call is best accomplished from Europe. But once you get
he call # and a name of the support person assigned, you should be able
to do all you communication via email thereafter. Thus, you could
minimize the pain of time zone differences between Calif. and Germany.
That's what I did when I called in my VideoSplitter support request, even
tho I was at NASA Ames only about a mile from SGI HQ.
If you don't have full support, then hope that someone in info-performer
can help you.
Lew Hitchner
Virtual Reality and Visual Simulation Consultant
Mountain View, CA
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