Re: [APML] M101 re-done

[John Laborde <jlaborde@ix.netcom.com>]

All,

With Alans permission. I reprocessed his M101 image from a compressed 
jpg he sent me. Here it is:
http://aisig.sdaa.org/astroblogDetail.asp?imgID=445&UserID=67

Everything done in Photoshop 7. Here are the basic steps I took;

1. Adjusted levels to put the dark point at the foot of the curve for 
each Red, Green, and Blue separately.
2. Made a slight curves adjustment on each color separately to get a 
neutral sky background. Just slightly blue.
3. Made a flat field mask using the Jerry lodreguss method and 
subtracted it from the image.
4. Re-adjusted the dark point again in levels for each color.
5. Fine tuned curves to keep slight blue sky background and get rid of 
green in galaxy.
6. Did some grain reduction using NeatImage.
7. Final curves to bring out faint detail in galaxy arms.

John Laborde

Alan Voetsch wrote:

>Hey all,
>
>I have a newer shot that I have been trying to work with but it has
>whupped my butt all day long so it's in 'cold storage' for awhile. I
>did however, run my existing shot through The PixInsight LE program to
>remove the vinetting. It came out a little light in the BG, but it is a
>big improvement over the previous effort. I may try to combine the
>images because the camera angle was essentially identical (got lucky
>there).
>
>http://www.pbase.com/avoetsch12952/image/39939095
>
>BTW again (OT), the Michigan State-Kentucky game REALLY wrapped up a
>great weekend of college BB. WOW!
>
>Anyway, comments welcome.
>
>Alan 
>
>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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