My lights are binned 2x2 in the camera, but I forgot to set the same binning for the flats and darkflats. Does this matter when preprocessing them? I am using Astro Pixel Processor.
Do flats and darkflats need to be binned the same as lights?
Well written Engaging
I never tried to calibrate binned lights with unbinned flats and darkflats but I would prefer to use flats and darkflats at the same binning of the lights.
If that is a problem, one thing you can try is:
- calibrate the unbinned flats with unbinned darkflats (I assume the different binning is 1x1)
- create a master flat with the unbinned flat
- downscale the master flat at the same resolution of the lights
- calibrate the lights and see if it worked
Good luck!
If that is a problem, one thing you can try is:
- calibrate the unbinned flats with unbinned darkflats (I assume the different binning is 1x1)
- create a master flat with the unbinned flat
- downscale the master flat at the same resolution of the lights
- calibrate the lights and see if it worked
Good luck!
Helpful Concise
Hi,
Downscaling will work if it is a mono camera but not with an OSC, at least not the ones from ZWO that I know of. The in camera binned image is still undebayered (mono) data formed by superpixels. It is possible to do the same thing in postprocessing but unfortunately not the same thing at all as debayering the unbinned image and downscaling with an RGB outcome. I think it is better to just take new flats. It is not like they change so much from one day to the next.
Cheers,
Dimitris
Downscaling will work if it is a mono camera but not with an OSC, at least not the ones from ZWO that I know of. The in camera binned image is still undebayered (mono) data formed by superpixels. It is possible to do the same thing in postprocessing but unfortunately not the same thing at all as debayering the unbinned image and downscaling with an RGB outcome. I think it is better to just take new flats. It is not like they change so much from one day to the next.
Cheers,
Dimitris
Helpful Insightful Respectful
As Dimitris said you can't. But, were you in absolute need of those flats for whatever reason you can resort to splitting the flats in their RGB components without debayering and use PM in PI to reconstruct the binned ones. Or Iris and Excel.
There are 3 reasons for using flats:
1. Removing vignetting
2. Removing dust donuts
3. Correcting pixel to pixel variation in QE (Usually less than 1%)
Downscaling binning 1to binning 2 will correct 1 and 2 but not 3.
1. Removing vignetting
2. Removing dust donuts
3. Correcting pixel to pixel variation in QE (Usually less than 1%)
Downscaling binning 1to binning 2 will correct 1 and 2 but not 3.
Helpful Concise
Many thanks everyone for these helpful replies.
Newton Flat Problem (Ring pattern) Light pollution a cause?
Hello guys, I've already read a lot of forum post about this topic. Usually the problem apears to be reflections inside the tube, light leaks, sometimes the corrector sticking inside of the tube or a GPU causing wierd stuff. Some people are doing...
Discusses flat fielding issues; may address binning mismatch problems.
What is the "Mono bin" button in my ASI air app? I'm using a color cam...
when I read what it was about in my ASI app, all I think I could understand was that it converts the color pixels and groups them and turns them into 2x2 bigger but monochrome pixels… what's this for? and why so few people talk about it?
Explains pixel binning concepts relevant to understanding binning mismatches.
Please share your thoughts about when the flats should be taken during a session.
I am looking at all the information and different opinions available on the internet on whether flats should be taken after the subs, or that it is ok to take them at the beginning. There seems to be a consensus that it is absolutely imperative to ta...
Addresses flat frame acquisition timing and procedures during imaging sessions.