How to Stack Data From Two Or More Imaging Sessions in WBPP

Рет қаралды 1,971

Күн бұрын

The more information you have, the clearer, cleaner and better your images will be, and that often means imaging a target over multiple nights. When it's time to stack all that information, you need to keep the appropriate calibration frames with the associated lights. Doing this in PixInsight's Weighted Batch PreProcessor script (WBPP) is not difficult.
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Пікірлер: 22

@petekrz Ай бұрын

After the first night of processing, I change the reference frame from 'auto' to 'manual' and point it to the frame that the first night's processing selected. I use the same PixInsight output folder for the processing. This allows PI to skip having to re-register the earlier night's images. The only processing that happens on the 2nd (and subsequent nights) is the calibration and registration of the new data, and the stacking of the new data (possibly with earlier nights that used the same filter).

@JoseLausuch Ай бұрын

These keywords are powerful. I use the word SESSION for each night, which takes different lights and flats. For mosaic it also works perfectly, but you need to make sure to select "post" to the keyword so it creates 2 masters, one for each panel.

@SKYST0RY Ай бұрын

I've never used WBPP to make a mosaic. Good to know.

@janelubenskyi1177 Ай бұрын

Thank you Sky Story❤

@IronMan-2024 Ай бұрын

I had to add an extra layer of complexity when I did a 4 panel mosaic of the Veil. Initially I used the target name in the file name but WBPP added a few alphanumeric characters after the keyword panel. I restructured the output in N.I.N.A. to have a directory with the panel keyword and index such as “Panel 1”. WBPP properly parsed this structure. WBPP is quite a tool in PixInsight.

@SKYST0RY Ай бұрын

I've never used that approach. When I've made panels, I've designated each data set with an individual tag, stacked them, then used other tools to create the mosaic.

@chrislee8886 Ай бұрын

To be honest i remain a bit confused. Sorry. My concern is how to combine two nights imaging of OSC especially for a mosaic. So i stack and process night 1 with its own calibration files in SiriL (easy). I then similarly stack and process night 2 (easy). I now have two images with stars registered, bad frames removed, satellite trails gone as a pair of .fit files. However night 1 had a poorer sky than night 2 (say a bit more moon glow). Thus i assume i need to do a background extraction on both but with different values yet i will probably still have “different” sky images and that is a pain for mosaic post processing. What then does Pixinsight do that is different? What does “Weighted” mean here? I thought it somehow assesses the two backgrounds and solves my dilemma of how to adjust the sky background between both shots so that a possible mosaic is easier to match? Beyond a batch stacking process i don’t see the added value? Perhaps OSC is less sensitive to such preprocessing “effort” needed for LRGB?

@SKYST0RY Ай бұрын

For myself, when processing mosaics, I process each individual image in its own stack then use PIs mosaic balancing process to combine them. However, sometimes PI is a poor tool. I have videos where I have exported the sections of a mosaic and combined them in Affinity Photo where I have more discreet control of how backgrounds are matched and balanced.

@astrofromhome Ай бұрын

Great information! Never thought about the option with the key words. I usually just dump all into WBPP and prey that it sorts out well. 😂One question as you have demonstrated your workflow with two nights now. Do you process the next two nights the same way and combine the two results? Or do you start from scratch in WBPP with all four nights?

@SKYST0RY Ай бұрын

Every night you get more information, you can just create a new night_x folder (you can name the folder anything you want, just give it a number designator at x) in the placeholder folder and add your new calibration and light files to it, and then reprocess all the information. So, if I had four nights of information, the folder tree would look like: PickeringstoStack ight_1, night_2, night_3, night_4.

@janelubenskyi1177 Ай бұрын

Question Please….if we were to combine data of different image scales from different set ups…how would this differ from this tutorial and would you make a specific tutorial for this case.😊❤

@SKYST0RY Ай бұрын

That's a good point. I will cover it eventually, but probably not till I have built the second observatory at which point I will have two very different setups operating. However, I can tell you now it is entirely to combine data from different setups in several different ways. You don't even have to do it through stacking.

@antoniomoratilla Ай бұрын

thank you. One question: can reuse the already processed data if another night is added or should be done everything again from start?

@SKYST0RY Ай бұрын

You can just re-use it. Every time you get more information, just create a night_x folder for it and have WBPP stack it all again.

@alistairfrith7772 Ай бұрын

Superb video, thanks. One question: I am just moving into collecting data over multiple nights but I also have a library of darks and bias that I apply to all my images. Is it possible to avoid having to copy those into each night's folder tree? Maybe I just have the lights and flats in the folder tree and then, after loading those in, I separately load in the darks and bias from the library folder. Will it know to apply those to every night?

@SKYST0RY Ай бұрын

You should be able to just copy the master dark or master bias into each folder tree.

@alistairfrith7772 29 күн бұрын

@@SKYST0RY Thanks. I'll try that. It's throwing lots of errors during normalisation at the moment but does result in a master light (of the Pelican nebula) that has something in it. I need to study your video, and possibly a few others as well to understand what's going on.