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 must be doing something wrong? I enter my boxes and calc and it never removes vignetting. But it does always ADD A BRIGHT WHITE VIGNETTING?Â
I'd love to remove my mild vignetted corners.  (LP removal tool works fine)
Hi Ron @rojoyinc,
The Remove Vignetting tool is only to be used on data that did not have any flats applied. If you used flats, this tool is not the one you want to use. Indeed, simply use the LP removal tool in that case 😉
The remove vignetting tool uses real vignetting models so the data must have an original vignetting profile not yet partially corrected by flats.
And if you do use it in case of no flats for your lights, it's very important to place the area select boxes nicely divided over all the data on areas where there is no nebulosity, so the areas must only have stars and sky background.
Let me know if this helps 😉
Mabula
Flats are always a good thing to have (when taken properly, which can be a challenge). It will help to produce a better background overall then just working with the pollution tool alone.
@vincent-mod
I stopped doing flats after the first year of astro imaging. Especially with OSC.  ONLY LIGHTS - there is a bit of vignetting all around and more in the corners. I drop the boxes on the dark vignetted areas and on the background away from it (for comparison). I've tried many time using various boxes and I always am given a WHITE inverse vignetted effect (horrible) I undo and crop it out. It would be nice if it worked?Â
I've had so much more fun and have been far more productive since not using darks or flats. Just wished it would flatten the vignetting.Â
Recent shot with only lights...Â
BUT I did have to crop vignetted area. = (Â
