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Can not calibrate Images captured with EKOS (stellarmate) in Pixinsight?

Is this bayer related? is there a FITS keyword to specify the orientation?
5 years 1 month ago #34370

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My lights are also RAW16 so they are not debayered. But I think that is not the point. PixInsight doesn't seem to be able to unambiguously determine the orientation.

Could it be that there is some information added in the keywords that causes this?
5 years 1 month ago #34372

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I do not think it is a bayer issue,
5 years 1 month ago #34373

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Possibly the darks and flats do not have coordinates data in them. You can check this by inspecting the fits header.

Can you share a few of each via dropbox, google drive, or similar?
5 years 1 month ago #34378

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Isn't it the same size as the light frame you attached to the post? Unless you mean the stacked masterflat.
A single flat frame would be just fine to inspect this issue. This way we can look into it and help.
5 years 1 month ago #34379

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I did check and indeed there are no coordinates in the flat files. But there needn't be.

Please check out my Onedrive folder below

1drv.ms/f/s!As3ajDTyZ50_hcZc0kb1vmiL3lWCfQ

It contains the lights and the flats.

The thing is though that when I load just 1 light PixInsight will already warn me.

I will also try and post this question on the PI forum. I would assume there are a lot more people trying this combination...
5 years 1 month ago #34395

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Hi
Are you certain that PI is not trying to debayer the light frames; a default setting perhaps? The lights you have are to create only a monochrome image? I ask because the 294 produces superb colour images; it would be a pity to create only mono from it.
Last edit: 5 years 1 month ago by alacant.
5 years 1 month ago #34396

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I set the images to be taken in RAW16. That's how I always do it, also in SharpCap. Debayering is done after calibration, I'm sure of that. If I compare the Fits data from an image taken in sharpcap the Geometry data is exactly the same. EKOS just adds a lot more information, which is great, but probably some info that is ambiguous...

This is what PI tells me when loading an image taken with EKOS:

open "C:/****/StellarMateCaptures/M81/M 81_Light_30_secs_001.fits"
Reading 1 file(s):
C:/****/StellarMateCaptures/M81/M 81_Light_30_secs_001.fits
** Warning: Deprecated format: FITS
52 FITS keywords extracted.
Reading FITS image: 16-bit integers, 1 channel(s), 4144x2816 pixels: done
* Loaded astrometric solution:
Reference matrix (world[ra,dec] = matrix * image[x,y]):
+3.19292082e-04 -5.45096074e-04 +1.06354272e-01
-5.45096074e-04 -3.19292082e-04 +1.57888942e+00
WCS transformation ...... linear
Projection .............. Gnomonic
Projection origin ....... [2071.500000 1408.500000]px -> [RA: 9 55 34.162 Dec: +69 08 41.16]
Resolution .............. 2.274 arcsec/px
Rotation ................ -59.640 deg (flipped)
Transformation errors ... ex=4.55e-13 ey=2.5e-12 px
Observation date ........ 2019-01-28 19:46:36
Focal distance .......... 419.93 mm
Pixel size .............. 4.63 um
Field of view ........... 2d 37' 4.3" x 1d 46' 44.2"
Image center ............ RA: 9 55 34.454 Dec: +69 08 40.75
Image bounds:
top-left ............. RA: 9 56 51.450 Dec: +70 43 22.71
top-right ............ RA: 10 11 07.300 Dec: +68 25 10.89
bottom-left .......... RA: 9 39 01.828 Dec: +69 46 33.99
bottom-right ......... RA: 9 54 27.845 Dec: +67 33 56.94

** Warning: The FITS format does not define an unambiguous orientation of pixel data. The coordinates read on the image may be wrong.

This is what it tells me on an image taken in Sharpcap:

Reading 1 image(s):
C:/****/M81/03_11_57/rawframes/frame_0.fits
** Warning: Deprecated format: FITS
24 FITS keywords extracted.
Reading FITS image: 16-bit integers, 1 channel(s), 4144x2822 pixels: done

Maybe if I could take out the astrometric solution data it will not give me the message.
5 years 1 month ago #34397

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Guys, I have just opened a single light and single flat frame in the latest PixInsight.
I would ignore these warnings:
** Warning: The FITS format does not define an unambiguous orientation of pixel data. The coordinates read on the image may be wrong
** Warning: Deprecated format: FIT
They do not (or should not) impact calibration process whatsoever.

BUT

When you take a look at FITS header of both files you will find the answer why you cannot calibrate frames.
Light frame: 4144px x 2816px
Flat frame: 4144px x 2822px

The geometry of the files does not match in axis2 (NAXIS2). This is the actual reason why you cannot calibrate.
However, I cannot point out a root cause. Driver issue?

Could you capture just 1 light and 1 flat frame with Ekos with debug option enabled? One by one. Exposure and object does not matter.
Check the FITS Header pixels and post the logs for us.
The following user(s) said Thank You: Marco de Keizer
5 years 1 month ago #34398

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Well that's weird. Only the first image has, all other do have 2822px.
I checked out the other captures from IC1805. And there is also 1 image with 2816px (the second image in the sequence).

I did immediately check if could calibrate, leaving out the first image. And YES the image gets calibrated just fine!
I was so focused on the ambiguity message that I did not notice this discrepancy.

Sorry for the inconvenience caused!

I will now do as you asked and try to get you some logs and sample data.
5 years 1 month ago #34400

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OK then, so now we know that some images miss 4 vertical lines. We don't know why but we're closer to a solution anyway ;-)
Let's debug. Maybe we'll find it out. Good luck!
5 years 1 month ago #34401

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That reminds me of my most recent session. I had to delete the first light image taken in order to have Regim calibrate and stack them. I didn't examine what the cause was but I guess I know what it was now. I used an ASI 294, too.
5 years 1 month ago #34403

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