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 together,
Looking for support with stacking:
I am stacking my yesterday's images of M101 with Astro Pixel Processor. The camera is a mono IMX571 chip.
As always, I'm using Masterbias and Masterdark from the library, which usually works.
I threw in the flats I took today. However, it doesn't seem to add the masterflat to the light.
As soon as I want to switch to the calibrated image, I get a strange result. Everything looks flat and heavily darkened. As you can see from the entries below, the MF was not used for the calibration.
All shots were taken as usual with NINA. Can anyone explain this?
I have the same phenomen with Pixinsight too.
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Thanks for help!
Christian
calibrated
 uncalibrated
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Hi Christian @gru89,
Thank you very much for posting your issue.
Did you create the masterflat while also loading the bias/masterbias to make sure that the sensor offset is subtracted from your flats? If not, that will explain your issue I think.
Please try to load the MasterDark, MasterBias, the newly created flats and your lights and then calibrate and check if the masterflat is created properly and if it will be assinged to your lights and let me know the outcome.
What you can also check if the masterflat has the same pixel dimensions as your lights, it should. Can you double check this?
Were the flats shot with the same sensor gain and offset as the bias? And with the same NINA version?
An issue like this is almost always created by an incompatibility between the flats versus either the lights or the bias/darkflats.
Mabula
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Hi Mabula,Â
thanks for your answere.
Did you create the masterflat while also loading the bias/masterbias to make sure that the sensor offset is subtracted from your flats? If not, that will explain your issue I think.
Yes, this is my standard workflow all time. Loading lights, masterdark/bias and adding the fresh taken flats for calibration.
What you can also check if the masterflat has the same pixel dimensions as your lights, it should. Can you double check this?
Pixel dimensions are the same.
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Were the flats shot with the same sensor gain and offset as the bias? And with the same NINA version?
An issue like this is almost always created by an incompatibility between the flats versus either the lights or the bias/darkflats.
All flats were shot with the same sensor gain and offset as the bias. NINA Version was indeed different.
So you would recommend to take new MasterDark/Bias after each NINA update? Fortunately for me, I was able to calibrate the lights manually in Pixinsight so that not all the shots were lost.
Best Regards
Christian
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Hi Christian, @gru89
Okay, thank you very much for all the feedback.
Another reason for the master flat not being used, could be the following:
In 1) load you may have enabled the multi-channel/filter mode, then if your flats/masterflat do not have the same filter tag as the lights, they will not be applied to your lights. Maybe that explains it? You can overrule the filter tag when loading the flats, just make sure that they have the same filter tag. Once loaded, you can see all these details in the frame list panel in the frame column. You can see if the master flat is attached to the lights as well.
Maybe this solves it?
Mabula
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Hi Mabula,
thanks for your response! That could be a valid option, yes! That would explain why I had this problem in the past, at most with H-alpha images.
I will give it a try after work and give you a short feedback.
Best Regards
Christian
Hi Mabula,
setting the right filter here, worked 🙂
Thanks for your help, as always!
Best Regards
Christian
