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.
Hello!
This is my first post here. I am currently on the trial version but will buy APP when the trial expires. It's a good piece of software with some pretty neat tools.Â
However, I've never been able to correctly apply my flats in APP. If I use the exact same flats and lights and stack them in a different program like Pixinsight or DSS, everything goes smoothly and I have zero vignetting left. So it's not bad flats or anything, it must be a software/user error issue.
In APP I get really weird results. Almost as if my flats are inverted, so I also tried inverting a master flat in Pix and then integrating that in APP. Did not work.Â
I am really desparate to solve this issue. Any help is welcome.
 Here is the l-calibrated view.
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Flats were 3-4 seconds each. 3,6s for this particular filter set (SII). The problem occurs on all three sets though. I did not take dark flats but I have bias and darks. Camera is a 294mm
Would you be able to upload 10 flats, 10 bias, 10 darks and 10 lights for me to check? It may still be an issue in the data so would be nice to see what's going on.
Not meaning to hijack this thread (so feel free to delete if this is irrelevant), but Vincent, could this be related to my issue at https://www.astropixelprocessor.com/community/main-forum/creating-a-master-dark-flat-what-am-i-doing-wrong/#post-25977 (i.e. the master flats Ben is making in APP (as opposed to his processing in other software) have too high an ADU in some way?)
I can't tell to be honest, I do know it's never a good idea to mix programs for processing calibration files with lights. The way calibration is done does differ sometimes, not usually in the way you're experiencing though.
