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 seeing an issue with some recently taken Dual Band Ha-OIII images on a OSC camera (ASI183MC with a SVBONY SV220 dual band filter). Telescope is a ED102.
When I Extract Ha I get a good even image, with no odd black pixels, but when I run Extract OIII I get black pixels around stars, and what looks like clipping or some sort of other halo around bright stars. The histogram also looks a bit odd for the Extract OIII compared to Extract Ha.
These black pixels do not line up with any features on any of the raw frames, or any of the calibration frames (bias, dark, flat, flatdark), and I can't think of where they are coming from.
I use the same settings for both Extract HA and Extract OIII.
I don't see any issues on my RGB images from the same camera.
I can post raw and calibration FITS and other files as needed.
thanks
Andy
Adding a screenshot of a raw light frame
To rule out a Java/linux issues I'll try taking the same data set and running Extract OIII on a Windows PC.
Edit: Confirmed the same issue taking the FITS data set and running on a clean installation of APP on a new machine (MacOS). So it's not my settings or my OS/java config.
Found what may be the issue
my 180s master dark is dark in red but not so much in green and blue….
will retake tonight and retest
Confirmed the issue was resolved with new dark frames.
