star align - (subs including pre and post meridian flip?

[Ron Kramer]

I'm new to Pixinsight - I'm trying to star align and some of my subs are pre- and others are post- meridian flip.  I'm fairly certain it aligned (flipped) files that I worked on previously? 

Now it doesn't seem to do it.  I often run the preprocess batch file and that spits up on the flipped images.

Any quick easy way to allow this?  It seems like it would be a very common issue.
Also I'm really tired of all the work - are there other great batch files?
I do like the preprocess... it seems to work well.

I shoot mostly nb.  Here's my latest from last week.

[Ron Kramer]

I think I found the answer in another post. I read this.

"If you are using the Batch Preprocessing script there is also Up-bottom FITS option available"

I didn't know what that meant. I tried it on 4 images - 2 flipped and it appeared to align properly!

[RickS]

BPP usually deals with a this perfectly well in my experience and I almost always have meridian flips in my data.  For tricky alignments you can always use BPP to calibrate only and then use StarAlignment manually to tweak parameters as needed.

Cheers,
Rick.

[bulrichl]

I think I found the answer in another post. I read this.

"If you are using the Batch Preprocessing script there is also Up-bottom FITS option available"

I didn't know what that meant. I tried it on 4 images - 2 flipped and it appeared to align properly!

This is a misunderstanding. A change of the FITS option 'Coordinate origin' will mirror the image vertically. By a meridian flip, the image is turned by 180°. That's not the same! You don't want to change this setting ('Coordinate origin') when your images come out true sided.

Images before and after meridian flip will be aligned together in one operation, no changed settings are needed.

Bernd