Re: [APML] Processing Challenge: LMC

["John Boudreau" <jeboud@attbi.com>]

Here's my attempt:
http://home.attbi.com/~jeboud/apml.htm

The uneven fogging of the film is a pain. I'm just not sure if there's real
nebulosity in some sections or if just fog--- or a combination of both. This
image is really subject to a lot of different interpretations. I don't think
I'd do it quite the same twice. As a learning tool to share processing steps
with others, this image has too many issues IMHO.

Since the uneven fogging caused me to make so many steps besides just AV,
it's tough to describe what I did in detail. Making an AV mask, grabbing fog
spots with the lasso tool for localized curve corrections, Mike Cook's star
erosion technique, and just plain 'ol fiddling with curves were done in PS6.

I'm still in the early stages of learning SGBNR, and used the channels set
to AUTO and a filter radius of .75, and the Global Filter Order set to .90
with the truncation set near mid-point (truncation setting didn't effect it
noticeably). All other tools were off.

The image was then mildly unsharp masked in MaxIm DL.

Time for a beer. <g>

John Boudreau
jeboud@attbi.com
http://home.attbi.com/~jeboud/astro.htm

----- Original Message -----
From: "Matt BenDaniel" <matt@starmatt.com>
To: <astro-photo@seds.org>
Sent: Tuesday, May 14, 2002 9:39 PM
Subject: [APML] Processing Challenge: LMC


> Below is a URL to an unprocessed 8.5MB TIFF of the Large Magellanic Cloud.
Also below is a link to a processed version of the image. I chose this image
because I could not make it look as nice as I want. I am hoping that y'all
will show me a thing or two with it. That said, this is a difficult image.
It has major vignetting and red fogging (probably from film age and or
humidity). If you're new to image processing, this is a tough image to start
with.
>
> Because there is some nice stuff on the edges, I'm hoping that you won't
crop your version.
>
> One thing I don't have yet is SGBNR or Grain Surgery. I think that would
help this one a lot.
>
> You know that if you do a good job with it, the folks on the APML
(especially me) will want to know what you did in gory detail.
>
> I found that WinZip did not compress the file very much, so I didn't
bother with it. If you're on a 56K modem, it will take at least half an hour
to download. I downloaded the image and opened it in Photoshop to test its
validity.
>
> http://world.std.com/~mattb/lmc.tif
>
> http://world.std.com/~mattb/gallery/astro/lmc.html
> --
> Matt BenDaniel
> matt@starmatt.com
> http://starmatt.com
>
>
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