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 all,
Since a couple of months, I have been getting very weird integration results on some (not all) stacks ... The stacked result looks a little bit like a fisheye lens picture.
There must be a setting which I changed, but I have no idea what. It is not the problem with the FAT32 filesystem, and I have been getting many good results with no problems in the past.
When I change the registration mode to mosaic, the problem seems to be solved, but the stack still has a small barrel shape, if you look at the corners. It doesn't matter if I add calibration files or not, and I have the problem with all my equipment, be it corrected telescope pictures, or camera with normal lens like in the pictures I attached.
Does anybody have an idea what kind of setting could cause this behavior?
Edit: a test with DSS with the same files resulted in a completely normal stack with small alignement drift
Problem stack
Stack with mosaic registration:
I also get these distortions occasionally.
Sometimes they are very strange and sometimes even amusing.
Sometimes switching to mosaic helps.
Sometimes enabling or disabling dynamic distortions helps.
Sometimes selecting a different registration reference helps.
