On Mon, Jun 25, 2012 at 3:06 PM, amartyo banerjee <[email protected]> wrote:
> On Mon, Jun 25, 2012 at 11:31 AM, Arun Venkataswamy <[email protected]> > 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/ "கற்றது கைமண் அளவு, கல்லாதது உலகளவு" - ஔவையார் Known is a drop, Unknown is an ocean _______________________________________________ ILUGC Mailing List: http://www.ae.iitm.ac.in/mailman/listinfo/ilugc
