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.
I'm getting red halos around all stars when integrating with APP with Radian quad band filter lights.
With the same config in APP, when I integrate my lights from other filters (Optolong L-Pro is on the right) I don't get the halos (attached left is Radian quad and right is Optolong L-Pro). Also, all subs using the Radian quad filter have pure white stars, no halos:
Is there any easy fix to this? I'm hoping there is some setting I'm using in APP that is causing this - is there an easy way I can share all the APP settings in a forum post?
I'm too novice to know all the differences in the options I'm selecting in the tool though, I select the bayer in tab 0 and I use the bayer dithering, other than that for the most part using default settings (a few others I've changed like rejection, normalization etc but I don't believe those could be creating this?)
The camera is the ASI2600 MC pro (color) and lights are 5min.
Is it as simple as altering the multipliers? Given the real differences in the halos (vast variation) it seems just a broad multiplier will give very mixed results:
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Thx for suggestions
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Anyone have insight on why the red halos are happening only with the Radian Triad Ultra Quad-Band Narrowband Filter?
I can work them out somewhat with a lot of patience - but I'd love to understand what is causing this and to eliminate -
They are not visible in subs (Radian ultra subs)
They do not occur with same APP stack settings when I use other filters like Optoplong L-Pro.
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Thanks for suggestions!
Hi, first, leave everything on default in tab 0.
No need to change (AAP will recognise 2600 fits).
Although QUAD band, this looks similar to Dual band, mostly prominent Ha (red) / Oiii (green/blue) colors, especially for stars.
L-Pro is wide band RGB, hence you will see regular star color (red-orange to white, to blue), as opposed to any multi-narrow filter (the quad, l-enhance, l-extreme, etc).
See image here, from a photo i finished with l-extreme (dual band Oiii+Ha)
This is of course after process, reduction, neutralization, wb adjust, etc.
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And this is another old shot (with the l-pro) natural colors for stars:
