Re: [APML] Orion Mosaic (finally done)

[john laborde <jlaborde@ix.netcom.com>]

Title:

Hi Alan,

Sorry, I overlooked your questions in my earlier reply.

It's hard to say how much time I spent. I put it aside a couple of times
for a few weeks just so I could catch up on other astroimaging stuff. I probably
processed everything twice or three times trying different things. Al together
it was probably around 100 hours or maybe more. I don't think I want to know.

There were no areas that were treated or "pulled up" separately from the
rest except for one... well two. In the upper right there are some very faint
wisps of red nebulosity. I selected multiple areas around these nebulous
wisps and then used "Select>color range" with an appropriate fuzziness
to select just the wisps. Then selected just the red channel and adjusted
the brightness-contrast. I did a similar thing for the blue nebulosity just
above the Witchhead nebula but in the blue channel. I did this only because
blue does not print as bright on paper as it shows up on screen so I just
gave it a little boost for printing reasons. 

The normally brighter areas like the M42, Running Man, Flame, HorseHead area
were mostly washed out and were filled in with blended overlays of shorter
exposures. 

I almost forgot to mention that the two lower frames on the on the right
had column , the Witchhead and the one above it, had two additional 60 minute
exposures of Provia 400 added. Provia 400 is more blue sensitive and this
is where all the blue nebulosity is. 

John

Alan Voetsch wrote:
> Hey John,
>
> Overall, this is quite impressive. Makes me wish for a far larger
> monitor than the 19".
>
> --- john laborde <jlaborde@ix.netcom.com> wrote:
> > The 10 nights and 30 plus hours of imaging over a period of  2 months
> >  was the easy part. The image processing was by far the most work and
> > time.
> >   
> I know which part is more irritating, and potentially more
> time-consuming. About how much time did you spend on processing?
>
> It looks to me like much of the very faint nebulosity has been 'pulled'
> up quite a bit to the point that those areas compare favorably
> (brightness-wise) with much more dominant areas, like M42, and the
> Running Man. Did you do anything intentionally to mute certain areas,
> or stretch other areas?
>
> This is really an awesome project that you have done a beautiful job
> on, and thank you for sharing your building technique with us.
>
> Alan
>
>  
> > This is a reduced resolution jpg of the final image. The full res
> > tiff 
> > is 48" x 52" at 300 dpi
> > http://aisig.sdaa.org/astroblogDetail.asp?imgID=541&UserID=67
> >
> > here is how the image was constructed
> > http://aisig.sdaa.org/astroblogDetail.asp?imgID=542&UserID=67
> >   
>
>
> SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
> FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
> & http://www.pbase.com/avoetsch12952/fs102
> & http://www.pbase.com/avoetsch12952/takpf
>
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