Channel Combination/LRGB combination not aligning stars.

[DJago]

Hello, Never worked in anything but DSLR RAW files before so this is all new to me.  I'm trying to combine an integration of Ha and Oiii images, I've registered them in Batch preprocessing and stacked them in Image integration.  However when I go to combine the two in either Channel Combination or LRGB Combination I get a 'double' image with the stars not quite on top of each other, like this: .  I've run batch preprocessing several times with a different set of images and using different reference images all to no avail.  What exactly am I doing wrong?

[DJago]

Just realized It is a problem with MY Ha data not aligning properly, I'll look further into it.

Edit:  So I fixed the stacking on the Ha Data but I still have the same problem, the stars on the Ha and Oiii masters will not line up with each other when combined:

[RickS]

Did you register both Ha and Oiii subs against the same reference image?

[DJago]

Did you register both Ha and Oiii subs against the same reference image?

Yes, in batch preprocessing I used the 'registration reference image' tab and I've tried it with a Ha image and an Oiii image, both do the same.

[RickS]

Yes, in batch preprocessing I used the 'registration reference image' tab and I've tried it with a Ha image and an Oiii image, both do the same.

I've never had an occasion where I registered all subs against the same reference image and saw mis-registration that substantial and widespread across the whole FOV.  You can re-register the Oiii master against the Ha master with StarAlignment.  That will fix the problem but not the root cause.  I still think it is likely that you've used a different reference image when registering the two filters or done something else that interferes with the positioning of one or other master.  You could also try rerunning StarAlignment on all of your calibrated subs and redo the integration and see what effect that has.

Cheers,
Rick.

[DJago]

  You can re-register the Oiii master against the Ha master with StarAlignment. 

This worked, thanks.  But you're right, it doesn't fix the root issue.  I've got some RGB data now that I am going to combine with the Ha, I'll see what that does and if it behaves in the same way.

[DJago]

So I got some RGB Data and tried to combine it all, and I don't know what the hell I'm doing wrong.  After several attempts over the last few days and collecting new data, ,the LRGB images are just not working.  They all look like this:   Closer view here: .  This is driving me insane.

[DJago]

So upon further inspection of the images, It's stacking the frames before and after pier flip together without even flipping them.  It's literally stacked them on top somehow without even bothering to flip the appropriate images...  Why does DSS, a free program do this without any hassle, but a several hundred dollar program not?  This is ridiculous.

[RickS]

I suspect you're making some simple mistake.  If this stuff didn't work we'd all be screaming about it.

Did you use a single BPP run to register all the subs for all the filters?  If not, did you use the same reference image for registration every time?  I presume you didn't tick the Calibrate only box?  When you run BPP watch the process console output and you should see StarAlignment logging the transform it applies to each sub during registration.

When you run ImageIntegration where are you finding the files?  Are you using the registered files or just the calibrated ones?

Cheers,
Rick.

[DJago]

So now I've since deleted all the registration/calibration folders and started again from scratch after uninstalling PI and installing the new version.   Now I get this when I try to do batch preprocessing: .

[DJago]

Still having the above problem (and yes i'm selecting a registration reference image from the same blink folder my lights are from) but decided to register the files in DSS and then use image intergration in PI.  And I get alligned and (somewhat) coloured stars but no colour image? and still the same weird colour blobs:

[RickS]

The registration from DSS still doesn't look very good.  Perhaps there is a problem with your data.

I'm a mono imager so I don't know what is going on with your BPP and debayering.  Hopefully someone more knowledgeable will chime in.

I'd suggest making some of your data available for download but I'm about to go out to dark skies for a week.  If someone else offers to take a look that might be the quickest way to figure out what is happening.

Cheers,
Rick.

[DJago]

  Perhaps there is a problem with your data.

That's entirely possible, it's my first time using a non-DSLR.  I'm going to catch more Data tonight.  I also managed to get everything aligning properly in PI and it's registered the images a lot better, now I get a strangely coloured image and the weird coloured stars when I do LRGB combo with the Ha data, which is the image on the left.  However If I combine RGB without the HA I get a fairly normal looking image:   It seems to be a problem with it combining the Ha data to the RGB data.

[John_Gill]

Hi,

If your LRGB/NB images are binned you might have the alignment issue.  Perhaps try a "Linear Fit"

Look up
John

[DJago]

Hi,

If your LRGB/NB images are binned you might have the alignment issue.  Perhaps try a "Linear Fit"

Look up
John

Linear fit does the same thing unfortunately.  And same thing, RBG combination produces a normal image but when I add the Ha channel it produces the weird effect: .