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
I'm starting to use a color camera with a set of two dual band filters :
- classical Halpha/OIII
- Hbeta/sulfur
... so that I end up with a total of four channels
I just wander what could be a "simple" workflow to manage to combine 3 or 4 channels to reconstruct a color image.
I think I have first to extract single channels images from dual elementary images eg :
- session 1 Halpha (red) and OIII (green) then
- session 2 Hbeta (blue) and SII (deep red)
Then ?...
In particular, how do I get session1 and session 2 images registered ?
Hi @alpheratz06 !
I just have a duo-narrowband Ha-OIII but I combine those channels to my RGB images by using APPs RGB combine tool. That shouldn't be very different from combining Ha-OIII with Hb-SII channels.
But first you have to extract those channels from your lights. A simple (and maybe right?) way to do this, might be to integrate every single channel. You do that in APPs 00-Tab (where you set raw debayer algorithm). There is an option to choose "Ha-OIII only Ha" and "Ha-OIII only OIII". There is a topic in this forum mabula suggested to use this option on Hb-SII too (OIII=Hb, Ha=SII), until he implements an extra option, but as far as I can remember it simply does very much the same.
Once you extracted/integrated every single of those four channels, you go back and load those four integrated frames as lights and hit register again. Save those registered frames.
You can then use your registered frames in the RGB combine tool. There should be a HaHbSO formula or you can simply mix channels on your own.
