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.
After stacking the images in APP final stacked file doesn't have the blue channel when i stretch the image. the whole image have a green/yellow overcast. when i load the lights in the APP the channels are out of balance.Â
ive attached some fits file with flats, Dark flats and Master dark.Â
if anyone can have a go at it and can help me out with it. I'll really appreciate it.
im using Zwo 294mc proÂ
with Optolong L extremeÂ
Flats taken at same temp as lights
27KaduÂ
https://drive.google.com/drive/folders/107kE4OWkXy0MaPCaTjyyTWCaCETD4emW?usp=sharing
It looks like an issue with your flats and darks, your image without flats/darks looks ok.
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Thank you, I've tried stacking without flats still the same the Blue is missing in the final stacked image.
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Try with out the master dark, it works ok for me see above image and it looks like you are using PixInsight?
 This is what I'm getting without flats yellowish overcast and when i do channel extraction in Pix the blue channel is empty.
@jaspreet123456 I integrated your files in APP 1.083-beta2 and got this result
The histogram on the right shows that there is blue data in the result. The green cast needs to be reduced obviously and this is normal for OSC.
However, as @gary-clayton showed there probably is an issue with the master dark. When was the master dark created and with what version of APP? Do you still have the raw darks that the master was created from? If yes, please use those instead of the master and see if that solves the issue.
Also notice that you uploaded the master flat in the flats directory. Either only load the master flats or the raw flat subs and not both.
it does appear to be your master dark that is at issue, I stacked your image with out flats/darks in APP and then extracted
the colour channels in PixInsight, please see image below.
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@gary-clayton @wvreeven thank you both for your help it indeed was my darks, I did my darks 4-5 months ago i didn't know we had to do them regularly. I'll take new darks tomorrow and try again. Thank you both for your help. Really appreciate it.
