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,
I am having issues with a set of oiii data.
I get really strange artifacts in the illumnation profile of the stack, for a lack of better words, but only in the oiii, the H-alpha stack is smooth as butter and looks very good.
Ha:
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O3 with LNC:
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O3 Normalization map:
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It is quite obvious (to my eyes) that the normalization map fits very well with the problems in the image.
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If i turn off all LNC i get a better result:
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Does anyone have an idea what is going on here?
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The camera is a Altair Astro Hypercam 1600M and filters are Baader 1,25" filters.
The o3 is quite weak compared to the Ha.
Edit: I have inspected all flats, darkflat and lights, and I don't think there are any that sticks out as "bad".
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Any clues would be greatly appreciated. 🙂
Interesting, it almost seems to correlate with the bright patches in the stack without LNC.. I have no real clue, and my answer is going to get boring on this forum, but if you share some of the data I might get a better idea. 🙂 You can upload like 10 of each calibration subs + 10 OIII lights to our APP server, login/password: appuser please create a folder with your name on it first, thank you!
I figured it out. 🙂
The normalization issues were indeed a result of stacking artifacts introduced while stacking. When these were resolved by changing a few settings in registration, the problems were gone.
Excellent!
