AW: [APML] NGC 2903 OT

[Andreas Rörig <apml@andreasroerig.de>]

Hi Tony,

what an outstanding image. The depth is overwhelming.
I imaged NGC2903 myself a few weeks ago
(http://www.andreasroerig.de/g1/ngc2903.htm) but compared to your image
it looks like a snapshot. The four hours integration time for luminance
and also the long integrations for the color channels really payed off.
All these background galaxies give a special touch.

Best regards
Andreas

:=================================
: Andreas Roerig
: Bahnhofstr. 16
: 65599 Dornburg-Wilsenroth
: Tel. 06436/28137
: http://www.andreasroerig.de
: (Letzte Aktualisierung: 02.03.2004) 
 

> -----Ursprüngliche Nachricht-----
> Von: astro-photo-bounces@seds.org 
> [mailto:astro-photo-bounces@seds.org] Im Auftrag von Tony Hallas
> Gesendet: Sonntag, 21. März 2004 16:00
> An: Discussion of Film Astrophotography
> Betreff: [APML] NGC 2903 OT
> 
> 
> Hi Guys,
> 
>      Feels good to be able to offer something to my old group 
> ... I have always been intrigued by the strange bar across 
> NGC 2903 so I decided to take it on ... of note is that I 
> tried out a new system for opening the image out of 16 bit 
> data ... I only used curves to do this, no levels. It 
> occurred to me that each time you use levels to attenuate the 
> black point, you are clipping data ... so I figured out a way 
> to do the same thing only using curves ... basically you open 
> the image three times ... once to get the max out of the 
> "dark" data ... this will be a bit noisey and blow out the 
> highlights, once to open it to the point of smoothness, and 
> once to get the highlight data. You will use the curves 
> differently each time and then use layers to seamlessly blend 
> these pieces together, almost like dealing with an M-42 
> image. The end result hopefully will be an image that is 
> smooth but did not have to resort to a smoothing filter of any kind.
> 
>       I used the AstroDon filters for the first time ... 
> their claim to fame is the ability to shoot 1:1:1 RGB ... 
> with only minor tweaking I think the color came out beautiful IMHO ...
> 
>      Not much else to say except that I continue to use PS 
> for all my post processing with CCD data ... you cannot 
> underestimate the value of having worked with film to be a 
> successful CCD practitioner ... those of you who have or will 
> use a CCD will find this foundation essential to 
> photorealistic results.
> 
     http://www.astrophoto.com/NGC2903.htm

     Have a good one,

          Tony


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