19 June 2021: Our upload server https://upload.astropixelprocessor.com/ has been migrated successfully to our new office with higher upload and download speeds (nearly 10MByte/sec up/down ) ! We now have 1 general upload user called: upload with password: upload. The users upload1 - upload5 have been disabled.
31 May 2021: APP 1.083-beta2 has been released ! APP 1.083 stable will follow soon afterwards. It includes a completely new Star Reducer Tool, New File Saver Module, Improved Comet registration and much more, check the release notes here!
Upscale binned RGB frames
I'm taking binned RGB images for my LRGB composites. In the whole processing chain at which phase do you advice to upscale the binned RGB frames? At the beginning, or at the end, after tweaking the combined RGB image? Which interpolation algorithm would do the best job on an upscale?
Thank yo for your answer.
Is there anyone with an answer? I'm quite new to this application and I probably miss something, maybe a feature or just a simple checkbox which gives a simple answer to my question. What you guys do when your RGB frames are binned? What is your workflow?
When I have processed binned 2x2 RGB subs with unbinned L subs, I have just loaded all the frames into APP (with appropriate binned and unbinned calibration frames to match) then processed them all in exactly the same way as if they were all unbinned subs.
When you get to 4) Register APP will I think have selected an unbinned frame as the reference image and will correctly align the binned and unbinned subs.
During Integration I assume APP uses drizzle method to upscale the binned subs to match the dimensions of the unbinned.
I've also successfully processed binned and unbinned RGB subs in the same integration - no problem.
Hope this helps
Yes, it does, and it makes sense as well. Thank you for your answer.
May I ask what drizzle parameters are set at the 6) integrate stage?
Mabula has written an excellent summary about principles and pros/cons of Drizzle on this forum post:
- What is Drizzle and when can I benefit from it ?
Unless you are experimenting (its always interesting to try things) or have specific reasons to choose otherwise, stick with the defaults.
PS Above I said 'During Integration I assume APP uses drizzle method to upscale the binned subs to match the dimensions of the unbinned.' On reflection, I think I should more correctly have said 'I believe APP uses an interpolation technique (Lanczos 3) to to upscale the binned subs to match the dimensions of the unbinned subs.'