Re: [APML] NGC 3953 using LLRGB technique

["Robert Gendler" <robgendler@worldnet.att.net>]

Jerry,
I think you may be misunderstanding the technique. Its not
traditional LRGB (which goes way back). Its a technique in which
a new higher S/N (and higher res) RGB is created by doing a 50%
LRGB first. Then using the new RGB a higher quality LRGB can
be created. You can also perform several "rounds" of this technique
with each round enriching the color data further.
Rob Gendler
Email: robgendler@att.net
Web site: http://www.robgendlerastropics.com/
----- Original Message -----
From: "Jerry Lodriguss" <jml@astropix.com>
To: <astro-photo@seds.org>
Sent: Saturday, April 20, 2002 2:18 PM
Subject: Re: [APML] NGC 3953 using LLRGB technique


>
> >>I used the "LLRGB" technique to bring up the rather
> >>weak color data.
> >
> >
> >It would be interesting to try this with color film as the RGB data and
> >Tech pan as the L data. Have any of you film guys tried that?
>
>
> Hi Roland,
>
> Yes, in fact, I even think we film guys were doing it before the CCD guys.
>
> I documented a technique very similar to LRGB where I substitued one of
> Chuck's high res hydrogen-alpha filtered technical pan images of the
> Pelican nebula into the K channel of a CMYK color image of mine that I had
> converted from the RGB original.
>
> See:
>
> http://www.astropix.com/HTML/J_DIGIT/ADVTECHS.HTM
>
> I wrote about it in the July 1997 issue of Sky and Tel, but I had it up on
> my web page well before that.
>
> Does anyone know when the CCD guys first started combining a separate
> high-res black and white with low res color data?  I'm curious about the
> time line. I bet they think they invented it!
>
> Jerry
>
>
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