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well by OK, i mean that the colors seem somewhere in the ballpark (galaxies are white/tan, stars don't look insane), there's no vignetting or dust bunnies (if the flats are upside-down and you have dust, you'll definitely see that.).

anyway the right thing to do is just redo all the calibration frames in SGP; i consider trying to fix the calibration frames kind of a hack (but fun to try)

i processed the image you posted and the colors seem correct. the gradient is removable with DBE. i'm also seeing some  'typical' OSC + refracting optics problems - the blue channel is not well-focused while the red and green seem OK. or, the blue channel might just be suffering from "blue bloat" which i guess is normally taken care of with a UV filter.

OK, so this is interesting. I created some new darks, although they are only 300 seconds, not 600 like the lights. Here's the result of a BPP with the new darks and the mirrored flats. I'm a bit surprised at the amount of amp glow, but when I just do a straight STF (click the button in the toolbar), the result is actually not terrible, although there seems to be a serious gradient. Not sure how I'd go about fixing it.
Well, what makes the data “ok”? We don’t know if it’s flipped or whatever, at this point, do we? There’s no screen door effect in the flats of course, but maybe I don’t know what makes them good or bad. I thought it was just the orientation that was the problem.
well the flats were weak in one channel and that can definitely produce a color cast, but it doesnt matter - you need to do color calibration (or at least view with STF channels unlocked) to see if the data is OK.

Well, I think I have somehow rendered my flats completely useless now. After mirroring them vertically and running BPP, the resulting finished product looks very blue. The c_d_r files look good if I run it without the flats though.
format explorer > double click fits > untick "thumbnail image" in 'override embedding settings' section, click OK.

Well, I did a vertical mirror based on the advice above, but for some reason when I save the file and re-open it, there's a new file with an _thumbnail suffix appended. When I tried running BPP with the newly saved files, it blew up, I believe because of the thumbnails, which incidentally don't show up as separate files.
I got this:

Calibrating target frame 1 of 28
[2018-08-21 21:31:30] Loading target frame:
[2018-08-21 21:31:30] /Volumes/Astronomy Pix/Pictures/Astronomy/ZWO_Flats/Flats-0001
[2018-08-21 21:31:30] * Subimage 1 of 2
[2018-08-21 21:31:30] Reading FITS image: 16-bit integers, 1 channel(s), 5496x3672 pixels: done
[2018-08-21 21:31:31] 46 FITS keywords extracted.
[2018-08-21 21:31:31] * Subimage 2 of 2
[2018-08-21 21:31:31] Reading FITS image: 8-bit integers, 1 channel(s), 400x267 pixels: done
[2018-08-21 21:31:31] *** Error: Incompatible image geometry

Bug Reports / Re: 'Unknown exception' : CometAlignment refuses to "Add files"
« Last post by pfile on 2018 August 21 21:17:45 »
what happens if you select only one file? is there a # of files beyond which this happens?

Bug Reports / 'Unknown exception' : CometAlignment refuses to "Add files"
« Last post by fkieffer on 2018 August 21 20:06:31 »

so I just finished preprocessing some pictures of 21p Giacobini Zinner, everything works fine (on Macbook Pro, PI version, until i ask for some "CometAlignment"

I can't add files : when i'm prompted to select the files, i get an "unknown exception" error message, and I don't know what's causing this !!
Console says :
Code: [Select]
Loading image: w=3906 h=2602 n=3 RGB Float32
63 FITS keyword(s) extracted.

So to be clear, here's how it comes :
clicking on "Add files" -> selecting the files -> clicking "ok" -> console output (see above) -> immediate error message ->  :'( :'(

I can actually select a list of files with any other process, only CometAlignment is causing trouble...
I tried
- rebooting
- reinstalling
- starting PI from another session (user)
- changing the file format, reverting to fit instead of xisf

Nothing seems to have any effect. Ideas ? Thanks for reading (and thanks+++++ for answering  ^-^)
General / Re: Splotchy background after Batch Preprocessing and DBE or ABE
« Last post by pfile on 2018 August 21 18:39:48 »
you should be able to tell what transform you need for sure by loading one of your lights with the fits reader set to up-bottom and then loading the same light set to bottom-up and see what transform you need to make them match.

but dont forget to set the reader back to whatever it was set to when you are done!

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