Re: [APML] Scorpius, Sagittarius, and the Milky Way

[Dominic Cantin <dominiccantin@yahoo.ca>]

Hi Wei-Hao !

 

What a fantastic image !!! That's the way to do astrophoto !!!

 

Did I told you , you spoil me ;)

 

Keep shooting !

 

Dom :)

Wei-Hao Wang <whwang@gmail.com> wrote:

> ALOHA,
>
> A new image is in 
> http://www.ifa.hawaii.edu/~wang/gallery/picutres/sco_sgi_milkyway.htm
>
> To correct the vignetting pattern, I used a little crappy but quick
> flat field method.
>
> As I introduced my flat field technique to you about half year ago, I
> took several
> images of daytime sky and average them to make a flat image. The old way is
> to nonlinearly match this flat with the sky background in a real
> astronomical image
> and then divide the image with the matched flat image. This method works quite
> well. I had showed the results on my Orion mosaic to you. However,
> this technique
> may be a little difficult for most people since it requires some computer
> programming.
>
> In order to see if things could be more simple, I divide the image with the flat
> directly (without any background matching). The result is the image
>  above.
> I have to say, this flat fielding is not perfect but the residual
> vignettign pattern
> can be so easily fixed in PhotoShop. I think this is worth trying. 
> You don't need
> to write a C++ program. All you need is to take a picture of daytime sky and 
> find a image processing software that does division (PhotoShop doesn't).
>
> Cheers,
>
> Wei-Hao
>
> -- 
> ________________________________________________________________
> Wei-Hao Wang :)
>
> Institute for Astronomy at University of Hawaii
>
> Address: 
> 2680 Woodlawn Drive Personal Website:
> Honolulu, HI 96822 http://www.ifa.hawaii.edu/~wang
> ________________________________________________________________
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