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've tried using all variations of flats from 12k ADU up to 40k ADU. At 40k ADU they overcorrect. I settled on 28.5k ADU and yet, they still don't remove all the dust motes. Just the 3 lightest ones. Two darker ones will not correct out. The camera was not moved, and I've been able to shoot a ton of variation on the flats at all those ADU values, as well as Flat-Darks. All calibration frames are at the proper temperature, and exposure. I'm at a loss.Â
Please take a look and see what the issue might be. I don't have this issue on my mono camera, so I don't know what might be wrong here. Bayer matrix is RGGB.
Dropbox download of 20 lights, 10 darks, 10 bias, 10 flat, 10 flat-darks.
Thank you Andrew! At the moment we're preparing for Astrofest London, so if you could wait till Tuesday next week, that would be very appreciated. I'll download the files then.
Are you still having this problem. I have the same issue with zwo asi 183mc and still trying to sort it out. I also have no problem with my qsi 690
Not anymore. I'm convinced the issue was my large telescope, and not camera calibration issues. I've been imaging with an EdgeHD 11, and focus changes wildly overnight due to temperature changes. These temperature changes and their effects on focus, means that the flats (set at my last focus distance from the nights imaging session), were only properly correcting a partial set of frames, and that earlier frames from the same imaging session were too far off focus from the last set, such that the dust donuts weren't getting corrected out. I don't tend to have this issue with my smaller refractors which are less effected by temperature changes, and therefore, easier to correct.
Are you still having this problem. I have the same issue with zwo asi 183mc and still trying to sort it out. I also have no problem with my qsi 690
Flats not working properly can have all kinds of causes, maybe you could make a new topic in which we can investigate?
