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.
Hey guys back with more questions. i'm getting this magenta tint around the middle of m33. this is 10 hours on m33 shot with my asi294mc pro. this is data collected over two nights. i used two sessions to integrate them. I get this tint with or without applying the flats and dark flats. if i try and use the light pollution correction tool m33 gets pretty washed out. any ideas on what is causing this and/or how to remove it?
i've attached a link to a google drive folder with the integrated stacks and a lights file. one with and without flats applied.
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https://drive.google.com/drive/folders/1W9HgNIeP-UU1gT4eFRKqjqQWFJoQ06G3?usp=sharing
 any insight you might have would be appreciated! thanks!
This looks a bit like you have a light leakage in the setup, could that be?
@vincent-mod
i don't think so but i will check that everything is tight. digging around on the net i came across a few threads about this camera (asi 294 mc pro) and others experiencing similar issues. some believing its dark current issues and possibly too much cooling? maybe this is icing? i was running the cooler at -20c on the last several images for the first time. seems most recommend not to exceed -15c. it also seems that zwo recommends shooting darks right after lights so you minimize any dark current issues. i only did 60 darks/flats/dark flats so i think i'll increase that to 100.
this is the first time i've noticed this occuring. its kinda weird. the initial stack looks pretty good but if i crop or use the LP tool it sure looks pretty bad.
i've uploaded a stack of just the lights and attached is the screen grab of it.
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@vincent-mod
this link is to four nights of integration. looks pretty good until its cropped or LP tool is used
https://drive.google.com/file/d/142mTJDR8-DwvAqtfbcwBWt6GXnRWrEWC/view?usp=sharing
Ah yes, ice is also a possibility. Most people tend to avoid that by slowly cooling towards the target temperature, so setting it in steps towards -15 or -20. I can look at the files, but in this case I think it's pretty clear something happened at the setup itself. I would first try another few subs by both step-wise cooling and checking the setup as well.
