2022-05-11: APP 2.0.0-beta 1 has been released !!!
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Anomalous L channel integration - suspect normalisation issue
I was processing a set of LRGB subs yesterday evening and encountered an odd result in the L channel. R, G and B all look OK.
While checking my input L subs I observe an issue with a few (c10-15 of 58) of them, when changing the viewer mode from 'l-c-registered' to 'l-c-r-normalised', so I suspect something is going amiss during Normalisation.
I have processed c60% of the input subs previously without issue but managed to grab a few more during a recent clear night. The calibration frame have all been used previously with other images without issue. I ran the integration a second time with the same result. Prior to starting this integration, I had done another target without issue and had simply cleared the previous subs and changed the working directory before starting NGC4244.
I plan shortly to re-boot my lap-top and do a further rerun to see if the issue is still present.
Could you check the offset you used for the subs and the calibration data?
Having rebooted and restarted APP the integration the results now look as expected.
I have no idea why it was only the L channel that had this odd result, or why it seemed to be only a small number of L subs that displayed very high contrast when switched to L-C-R-Normalised mode.
I guess there must have been some sort of initialisation or other transient issue as a result of switching targets without first restarting APP.
I have a CCD camera so offset is not something that I can set.