[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [APML] Opinions on Second Attempt at Comet Machholz's Ion Tail



Definitely better with the 2nd one Wade.  Looks pretty good to me.
 
Gary
----- Original Message -----
Sent: Tuesday, April 19, 2005 10:05 PM
Subject: [APML] Opinions on Second Attempt at Comet Machholz's Ion Tail

The image I took of Comet Machholz using Provia 100F showed some
promise; however, the ion tail was extremely faint due to thin
cirrus "erasing away" the captured photons on film.  Here are the
current versions:

First attempt:

http://tinyurl.com/7dep5

Second attempt:

http://tinyurl.com/8o72n

The first attempt I used curves without any selections.  This is
about the best one can do without destroying the "neutral"
background.  The second attempt I did the following:

1. Copied the blue channel into a New image,
2. Selected just the comet and ion tail using Select/Color Range...,
3. Once I refined the selection (i.e. removed unwanted selections
and a feather of 10), I saved it and copied the selection into the
original image,
4. I opened the selection and used Curves to brighten the ion tail
and comet.

I generally have a bad habit of making things more difficult.
Please, let me know if there's a better way of selecting a comet and
its associated ion tail.  In addition, let me know if the image is
over processed.  Finally, which image do you like best?

Thanks,

Wade


_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo