2026-10-09 APP 2.0.0-beta48 has been released !
This is mainly a bug fix release for the reported bugs in beta47. In addition it has a significant User Interface performance improvement noticable when you need to process 1000s of images in APP.
2026-10-03 APP 2.0.0-beta47 has been released !
This is a very big release... many code optimizations/rewrites, many parts of APP are much faster and more precise, especially star analysis and registration are much faster ! Big mosaics will go much faster 🙂
And we introduce a new preview filter, which includes the new Adaptive Deep Sky Stretch and a General Levels Stretch, this has been long over due. The old preview filter (the panel on the right side to stretch and preview your data) has not been updated for a couple of years and it is a critical part of any APP session.
Adaptive Deep Sky Stretch or ADSS is a much more intuitive stretch algorithm. It is also color preserving (which is a great new addition in itself ! ) which means that the highlights are no longer bleached, color is maintained from the linear data while stretching. You can simply stretch your data using the sky background level and signal width sliders which work much easier and more intuitive. You no longer need to fiddle with the old complicated sliders with zoom buttons. All the zoom buttons for the sliders are made redundant. And you can enter slider values in the slider value fields yourself. I will make a youtube video in the coming days to explain and fully introduce ADSS. Once the video is ready, it will be highlighted on the forum.
RGB Combine upgrade !. The RGB Combine Tool has been rewritten mostly. The tool is faster and easier to use and most importantly, the Luminance slider to inject a luminance channel or channels into the RGB composite is now working correctly. It no longer bleaches the RGB colors. Combined with the new ADSS preview, you will get much better and easier great composites with great color! I will also explain this in a new youtube video.
Hi,
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.
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While checking my input L subs I observe an issue with a few (c10-15Â 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.
L-C-Registered:
L-C-R-Normalised:
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.Â
I plan shortly to re-boot my lap-top and do a further rerun to see if the issue is still present. Â
Could you check the offset you used for the subs and the calibration data?
Hi Vincent,
Having rebooted and restarted APP the integration the results now look as expected.Â
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.
Regards
Mike
