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I took 12×5 min H-Alpha light-frames 2 days ago, made new darks (as I only saved the master-fits and not original raw files, which was a bad idea as APP uses a different raw processing than dcraw) and made my first flats with my new flatscreen.
At first I didn’t see the H-alpha option in tab 0, maybe that might be made slightly more clear? So first image is what you get with just Airy-Disk.. gone is the signal and loads of noise injection (as expected). Then I selected H-Alpha, Winsored Sigma Clipping in stacking and hit stack. Much better and much easier than my process in PI so that’s a plus. ? I didn’t make new bias frames yet, will do that as well to see that effect, now I still have quite a bit of wiggly background.
So that didn’t make much difference in the stars, but I tweaked a bit with using median instead of average, no background normalization etc and although it’s difficult to see, the background is better in this one. Also nice to have a bit of extra vignetting correction, the flats didn’t fully correct that. I do seem to have some pattern in the background signal.
Median is with more than 10 frames alwyas inferior to average stacking Vincent, so I would suggest only to use median with just a couple of frames. Have you applied bias or darks, or a BPM in calibration?
Why use no normalization? Normalization is actually an essential part of stacking. Or did you mean bacgkround neturalization? If you are working with monochrome data, like you do, this setting has no influence. It only applies to RGB data.
Ok, I just tried a couple of things as I learn like that. :) I figured I didn’t have enough frames for proper averaging. I applied darks, but no bias yet, I’m making those again right now as I didn’t have the raw files anymore. Will post an update when those are also included.
Background neutralization indeed, but good to know it also doesn’t make a difference here, the difference I see must than have been the extra vignetting correction. I’m learning fast and liking it more and more.
Ps. I’m adding BPM now, but I had this flow of changing stuff and then jumping to tab 6 immediately. But I now notice it doesn’t recreate the masters with tweaks I added, so it’s better to go tab by ta again when tweaking stuff in the workflow?
Below in the file list panel, you’ll see the column frame with markings about the progress of the frames in the actual processing,
CA = calirbated
STAR = star analyse
REG = registered
NORM = normalized
So if you want to tweak settings before normalisation, you can choose to click on create calirbation masters again. You’ll go to CA fase again. Then click on stack again in 6) integrate.
Maybe I can make a setting where you can choose directly to go to a certain fase again in the “past” ?
That would be nice yes, I’m noticing I want to jump back, tweak, jump forward, in between etc and it’s getting rather crowded with huge filenames and to clearly see where I did what. This is how I work with the History explorer in PI. But I didn’t notice those extra markings yet, so that also helps.
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