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,
It‘s not really an APP question - but hopefully someone can help me identifying what I do wrong in my process using APP 🤗
In the past I only had to use flats to calibrate out dust since my sensor was rather small. But since going to fullframe, I have to fight with vignetting as well... While removing dust in my lights still works pretty well, I do have issues to remove vignetting in the corners - although my setup is supposed to have an image circle of ~42 mm (Celestron C9.25 EdgeHD).
In my current process I do take 20 flats during day using a T-shirt. Exposure values are usually around 500-1000 ms - Exposure is driven by „Autoflat“ in ASIAIR. Beside those Flats I also use 20 Darks and 50 Bias.
Looking at the source data, I can not quite see/understand what may cause my issue - both (flats and lights) are not clipped in the histogramm.
I am unsure if my flats are bad (too short) or if I need to use dark flats as well?
Thank you for your ideas to better understand my processing!
So that's 0.5 to 1 second per flat, that should work, but it'll depend on the actual signal you see in the flat. Do you have screenshot of an unstretched and stretched flat? It sounds like you need to expose longer to be able to get a signal in the corners.
Some screenshots illustrating the issue - that's what you need?
You will notice some black area in the processed file in the upper right corner already. The more the data will be stretched the more it will become visible...
I also created a download for the given flat (valid until 31-03-2021):
https://www.rabbitjump.media:5101/sharing/RurJQrXWW
Thank you! So I'm looking at it with APP version 1.083 and it seems like flat 009 is different from the flat you show above. Can you post a screenshot of 009 as well? On my screen it doesn't look like it's so dark in the edges. I think there is variation on the light falling onto the sensor which may cause issues.
Flat #009 - looking the same like #001...
And the unstretched version of 001 is also the same? It may be interesting to go up with the exposure, not clipping on the right of course, but using more of the dynamic range you have to get the corners up more as well. That might help.
@vincent-mod
Yes #001 is identical, all Flats used are from a single sequence...
I will try to add more T-shirts and also increase the exposure time!
Yes and mainly trying to get the histogram to go more to the right might be interesting. Fullframe is always trickier as you get to deal with "shadows" in the focuser etc as well. And like you mentioned, try to use darkflats as well.
