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.
Hello!
Maybe this is a dumb question, but I was wondering if I could use data from an OSC sensor (like the ASI533MC-Pro) to make an SHO version by using the appropriate algorithms in the "0) RAW/FITS" tab to extract the corresponding emission lines and recombining them later on.
The use case I've been thinking about is OSC color data that has been captured from a dark site. I already own an L-extreme and Sii filters and use them on my light polluted backyard, but I'm wondering if I go to a dark site and collect full color data, could that be also useful to create SHO images?
Thanks in advance,
Lucas.
@ldipenti Hi Lucas,
No, that will not be possible. Both Ha and SII are red and cannot be separated from each other. You'll need to use the L-eXtreme filter for capturing Ha and OIII and the SII filter for capturing SII, even from a dark site.
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Wouter
@wvreeven Thanks Wouter, it was my hope that I could do some "narrowband imaging" from a dark site by using a technique like that, because otherwise to swamp the sensor's read noise I need very good tracking (that I don't have 🙂 )
Hi Lucas,
What you could try is to try to separate them like this...
1) Tab 0: Ha OIII extract Ha -> all the way till integrate: this will be your Ha for RGB Combine (Tab Tools)
2) Again in Tab 0: Ha OIII extract OIII -> you will need to normalize them again and then Integrate: this will be your OIII for RGB Combine
3) Again tab 0: Ha OIII Mono -> you will need to normalize them again and then Integrate: you can save as Luminance and pick it up a SII for RGB Combine
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Here you can find the video I got it from:
Hope it it is useful,
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Carlos
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@camarieu hi Carlos thanks for the suggestion. I was thinking that maybe the extraction algorithms were able to separate the two shades of red from Ha and Sii.Â
I will try this technique to see if it helps getting a nice image but I was looking to also get something scientifically accurate Â
Cheers,
Lucas
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