[Ilugc] Image processing in 16 bit color depth?
- From: arun289@xxxxxxxxx (Arun Venkataswamy)
- Date: Mon, 25 Jun 2012 17:29:47 +0530
On Mon, Jun 25, 2012 at 3:06 PM, amartyo banerjee <amartyo at gmail.com> wrote:
On Mon, Jun 25, 2012 at 11:31 AM, Arun Venkataswamy <arun289 at gmail.com>
wrote:> Also, anybody else interested in long exposure photography and/or
astro
photography? One tool which is an absolute must is a stacking software.
This seems non existent in the Linux world. My image processing / math
skills are not good enough to write one on my own. Anybody else having
any
luck on this? I am forced to depend on my Windows box to do most of the
processing work. Writing a stacking software for Linux does seem inviting
as the monsoons have set in and our telescopes and cameras are locked
in...
On the following link:
http://www.heroinewarrior.com/movies.php
please see the writeup for 'MOTION DEMO 5'. Is the process described
there what you are trying to do? If so, maybe you could use the
software called Cinelerra, available at:
http://www.heroinewarrior.com/cinelerra.php
or at
http://cinelerra.org/
Stacking in astronomy is the process of "adding" exposures (shots). That
is, if you take 20 Nos of 2 minute exposures (shots), a `stacking` software
will allow you to combine the 20 shots to create an image with apparent
information you could get with 20X2 = 40 minutes of exposure. Your links
below are perfect.
Also a google search for stacking software to use in astrophotography
under linux suggests the following links:
http://exposit.disjunkt.com/
This is a good link. Thanks.
It is very basic. Might be a good starting point for me to develop on top
of this.
This app seems to simply add frames together. Normally,
- Individual shots need to be `registered`, that is clip and realign the
stars in each frame so that the pixels can be overlapped blindly - Not
Done, assumes input is already aligned.
- Dark frame subtraction, that is, remove camera's signature noise at
given ambient condition - Done
- Vignetting subtraction, that is equalize bright and dark areas for a
given camera and lens combination - Done
- Actual stacking - New apps in the windows world have about 6 ways this
can be done. Some of them return incredible results. < Will try to work on
this.
http://dulle.free.fr/alidade/siril.php?lan=en
It claims to be a clone of IRIS. IRIS is one app which is so imposing and
has such a steep learning curve I have never been able to use it properly.
So can't comment on this.
Thanks for the links
Regards,
Arun
http://wondroussky.blogspot.in/
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