color plane registration for OSC data (Using 1.2.0 beta)

Software Siril
1

Hi,

I shoot with an OSC at fairly long focal length, so I get visible color plane misregistration due to atmospheric dispersion when shooting below 60 degrees. In Astro Pixel Processor there is a “align color planes” option during calibration that will align the color planes when it outputs it’s debayered and calibrated frames. Is there a similar option in SIRIL?

Also, I’ve tried the “One Star Registration (deep-sky)” option in the imaging tab for RGB alignment, but it doesn’t seem to do anything, here’s my process:

  1. Select a representative star in the middle of frame with obvious and representative directional color fringing due to atmospheric dispersion (i.e. red on one side, blue on the other).

  2. Select “One Star Registration (deep-sky)”

  3. Expect results to be visible on the image, or something to change.

I also performed “pick a star” and did it, also no change.

Did I miss a step or do something wrong? I’ve searched for videos or documentation explaining the details on this feature but couldn’t find it. Or perhaps this feature is only for compositing of separate R,G,B captures with filters? I’m not sure…

Perhaps I have to separate out the R,G,B channels and then recombine them with a tool?

2

To align color plan but that don’t take into account distortion. So I’m not sure it will help you.
1 - select a star
2 - right click and rgb align → one star

3

This could be done in manual fashion by extracting the three color channels of the color image, running a registration on them and reassembling them into a color image. That will be explained soon in a new tutorial, but you can also look at what the new script ‘RGB_Composition.ssf’ does, it’s explained inside it.

4

OK, I’ll give the RGB plain splitting and recomposition a try.