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Re: [APML] Astronomical Image Enhancement Trial
Hi Dave:
I'm sending you a CD with 2 tif files of the Seagull (IC2177). One file has
the final processed version as shown on my website at
http://www.astronomy-images.com/images/Nebulas/ic-2177.htm
It had all the tricks of the trade that I could muster --- including mixing
an H-alpha image with regular color images, erosion filtering and ddp'ing,
etc. The other file is a straight RGB combination with just Photoshop levels
and curves applied. More data on the optics, exposures, etc, are on the
website.
I'll be very interested in your results.
Thanks!
Bert
Bert Katzung
katzung1@attbi.com
www.astronomy-images.com
----- Original Message -----
From: <Aplanatic@aol.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Thursday, June 05, 2003 9:11 AM
Subject: Re: [APML] Astronomical Image Enhancement Trial
> Bert, Robert, Chris,
>
> Thanks for your replies.
>
> I wrote the software using Visual Basic and the algorithms are my own. At
the moment the human interface to my program is really poor. When I improve
it a bit I'll post a version of the program that you can play with.
Currently the program can only read .jpg and .bmp files, and can only output
.bmp. I'm no software whiz, so it may stay this way. Reading .tif files
looks like a real pain... Bmp files are lossless and photoshop handles
them, so all is not lost.
>
> Right now I'm trying various methods to improve the look of stars.
Suggestions for other image enhancement techniques are welcome.
>
> Bert: The algorithms were written specifically for color image
enhancement, but work with monochrome images as well. I'd love to try the
algorithms on one of your images. I can handle anything up to a couple of
megabytes. Send one along and I'll give it a try. I've fooled around quite
a bit with Tony's recently posted horsehead CCD image. It's a wonderful
image the way it is, of course, but the enhancements are interesting.
>
> Our cabin in the Mojave is coming along quite well. We now have a flush
toilet. What a luxury!
>
> Robert: I was very gentle on Richard's image. The user can "turn up" the
sharpening and noise reduction algorithms way beyond any sensible value and
easily make a big mess of an image.
>
> Chris: The dark artifacts around the stars over the Lagoon were indeed
enhanced by the sharpening algorithm. They were present in the original
image that I worked from. On unprocessed images the algorithm does not
produce these artifacts. The sharpening technique is based more on
deconvolution than USM, although it has elements of both (and some new
stuff).
>
> Dave Rowe
>
> Bert wrote:
> > Subtle but very significant improvements! The detail in M8 and the star
> > definition are both considerably better. I don't know how much more
> > improvement you can produce, but it looks mighty good right now. Have
you
> > tried any CCD images? I have tons of poor ones that could use
considerable
> > improvement! Let me know if you would like some and what image size is
best
> > for your modem speed. Or I can send a CD with lots on it.
> > PS: How's that Mojave observatory coming?
> > Bert
>
> Robert wrote:
> > I agree. You gotta look, but there is enough difference between the two
to
> > make it well worthwhile to have done the extra processing.
>
> > Are these programs you wrote or applications of existing programs?
>
> Chris wrote:
> > To me, it almost looks like a very mild USM was applied. All of
original
> > nebulosity seems to be there but the image looks like the contrast has
been
> > boosted. I also notice some slight dark artifacts around stars with the
> > Lagoon Nebula. Maybe this was because you applied it to an existing web
res
> > JPG image, as you mentioned?
>
> > Interesting stuff! I look forward to seeing more.
>
>
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