Calibration is reversing Y axis

[tstephens]

 :(I am just getting back to work with imaging after having to recoat my primary mirror. That has led me to regenerate calibration masters and update a lot of software. I tried an object I have done multiple times before using PixInsight, M51. The problem I have run into is that running the Batch Preprocessing script to calibrate and cosmetically correct results in images where the Y-axis is been reversed. I have never encountered this before and I have no idea how this is happening. It is probably a bug in what I am doing but I have attempted to redo this process four-five times and it comes out the same way every time. What is going on here?

[NGC7789]

Are you shooting with a DSLR? Make sure the "No Image Flip" setting is correct in DSLR_RAW settings.

See: http://www.pixinsight.com.ar/en/docs/19/pixinsight-dslr-settings.html

If you're not shooting a DSLR then I have no idea.

[tstephens]

I think I have found the problem although this points out that I previously had not understood one of the settings in the Batch Preprocessing script. This is the Up-Bottom FITS check box. I have found that if I select it the problem is corrected. Not sure why this does not come from the FITS header automatically which is why I was leaving it unchecked. Apparently in the past I checked this box because of the video (IP4AP) I watched while learning the system. That video just says leave this box checked since this is probably "appropriate". I clearly did not know what was meant by that.

[pfile]

unfortunately that is one problem with the FITS format. the writer/reader direction is not specified in the header, so you just have to know which is the right setting for your FITS files.

rob