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.
Please see the attached image. This was my final result after integration. I was using a Radian Ultra Triad filter with my ASI2600 MC.
Any thoughts on what went wrong or is this expected.
@msamazing That looks like light produced by the Moon to me. Did you take these images when the Moon was above the horizon? Note that the Moon is a strong OIII emitter.
If no Moon was visible then, yes, it may be light pollution.
The moon was not above the horizon but shouldn’t that filter cut out light pollution? I am using this filter:
https://optcorp.com/products/radian-telescopes-2-inch-triad-ultra-filter
@msamazing No, as I wrote the Moon is a strong OIII emitter (actually reflector) and you should avoid shooting OIII under moon light.
Having said that, the left and lower lower left of your image seem to have an excess of OIII when compared to other OIII images of this nebula on internet. That seems to indicate it is light pollution.
BUT it could be due to flats or other calibration files as well. Have you checked those and verified that they were taken correctly?
