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.
I have 400 Ha subs. My computer crashes I think overheating or something else.
If I divide them into 100 and get 4 Ha stacked, can I then restack the 4 frames in a new run to get 1 Ha frame?
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Any workflow guide on divide and conquer?
That is a perfectly reasonable approach...and one which mirrors what many of us do when returning to an object across multiple sessions....or indeed year after year.
Just crunch as many subs as your PC can handle conformably in each batch, then process those results together.
You would probably want to save the calibrated subs as you go along so that you can reprocess in the future if necessary (or if you upgrade your PC 🙂). This saves you having to remember which darks, flats, bias etc were relevant to each session.
Thanks Jon
Thankfully, my 500 subs all are with same flats and darks. So I plan to create 5 Ha stacks. And then stack those 5 into one Ha? That's how it works. I usually take my individual channel files to Pixinsight for combining and other stuff
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