On 28/12/17 05:25 AM, Carlos E. R. wrote:
Hi,
I have a bunch of sky photos with stars and some shooting stars (of 639 photos taken, 13 contain shooting stars, Geminids). I have seen photographs compossed of automatically joining several such photos so that you see one photo with a dozen(s) shooting stars.
How can I do that, in Linux?
(If not in Linux, then Windows)
The application I understand superposes several photos matching the stars one on top of the other (as dots) and the landscape, and then the shooting stars are seen as several lines.
Hopefully each image has a lot of the landscape in common so they can be aligned. The normal tools to do this kind of overlay are for HDR. It assumes you are overlaying a +1 and - over/under exposure to ewnhance the image. I won't go into the why of HDR. But it does overlay the images and combine them as you point out. - there is a HDR plugin for GIMP - there is hugin_hdrmerge - Merge overlapping images which has a LOT of parameters you can tweak! - there is Luminance HDR Luminance HDR is an open source graphical user interface application that aims to provide a workflow for HDR imaging. I've tried this and its very good - there is openexr, which I haven't tried - these is pfstools And of course there is the powerful manipulation command line tool ImageMagick, which can do pretty much anything you want, and which I'd look at first in your case. it has some GUI front ends/wrappers from 3rd parties. - there are options in other photoprocesing tools such as Darktable -- A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting frowned upon? -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org