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, apologies if this has been answered in another forum but I cannot find the answer. I am new to OSC processing in APP. I keep getting a significant green cast across the whole frame in the final integration regardless of what setting I choose in step 0, I have checked and unchecked force cfa devayer, tried both AAD and Ha-Oiii-color algorithms and they show no diff with strong green cast. I can however use the Ha extract and the Oiii extract algorithms successfully and later combine them into HOO bicolor but I can’t understand why I am getting that strong green cast. See attached photos. I have also included the Ha and Oiii separate integrations which seems fine in mono.
@7imlooigmail-com Hi Tim, do you also get the green cast when you enable Neutralize-BG in the upper right? What camera are you using? And what software to shoot the images? What calibration files?
@wvreeven I haven’t tried to check the neutralize-BG in the normalization step 5 yet, will try that, am using darks, flats and dark flats cal subs. Using asi183MC pro and acquisition in asiairpro. In asiairpro the subs were not showing green cast in RGB tho see photo attached
@7imlooigmail-com I didn't mean Neutralize BG in tab 5 but the checkbox once the integration is done. See the checkbox that the red arrow is pointing to in this screenshot:
@wvreeven ah that fixed it, thank you. Is this something we need to do all the time with duo-narrowband filters? Just trying to understand where the green is coming from, cheers
@7imlooigmail-com To be honest, I am not quite sure myself. OSC have twice the amount of green pixels than red or blue and that certainly accounts for part of it. But the OIII signal is much fainter than Ha so I'd expect a more or less neutral background to begin with. But I see it in my pics as well so perhaps there is a lot more green noise than red or blue which causes this effect. In any case, I'm glad that neutralizing the background like that worked.
