Richard,
Thanks for the link to the article, it was helpful.

One question about the histograms. You say that the histograms of the OIII and
SII channels should be stretched to closely match the Ha image. Is this true in
all cases? NGC6888 seems to be predominantly "red" (if Ha is assigned to red),
so wouldn't the resulting color image have a red histogram that is wider than
the OIII and SII?
joel

--- In narrowbandimaging@yahoogroups.com, "Richard Crisp" <rdcrisp@...> wrote:
>
> welcome to the group Joel.
>
> I tried to look at your images but they weren't loading. But let me say a few
words that may be of some help:
>
>
> I wrote the original article on narrowband imaging and it appeared in S&T in
aug of 2005
>
> the draft of the article is here:
>
> http://www.narrowbandimaging.com/tricolor_emission_line_imaging_crisp_page.htm
>
> the key things to keep in mind are to keep the histograms of the three
channels untruncated and of similar shape so that you make full use of the
available color gamut and avoid having one color (typically hydrogen) dominate
the mix
>
>
> ----- Original Message -----
> From: jkeshort
> To: narrowbandimaging@yahoogroups.com
> Sent: Tuesday, July 14, 2009 3:16 PM
> Subject: [NBI] NGC6888 Putting it Together
>
>
>
>
>
>
> Hello,
> I am new to this group, and am new to narrowband imaging. In fact, I'm
working on my first narrowband image, a bi-color image of NGC6888 (Crescent
Nebula). I feel as though I have good Ha and OIII data with round stars and a
sharp image. However, I am struggling with putting them together into a color
image. It seems as though when combining the images the color gets completely
washed out. I've tried mixing different arrangements, all with the same result.
>
> You can see the Ha image here:
http://www.buckeyestargazer.net/New%20Image%202.html It is 2hours in 15min subs
through an Orion Eon 80ED, mounted on an LX200GPS. The OIII image can be seen
here: http://www.buckeyestargazer.net/New%20Image%203.html
>
> Any advice as to how to combine the images would be most appreciated.
Perhaps the best thing would be for someone to take the raw Ha and OIII images
and see what they can do with it, then tell me what they did. I'd be glad to
send the images to someone willing to do that, but I realize that's a tall
order! Thanks in advance for any advice.
>
> joel
>