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 everybody,
I have 151 light frames of C/2022 E3.
After processing it with correction frames of course, it seem to have 2 comets in the image. the one on the middle ist obvious but on the left side there appears a second one... Also we see different lenght in the startrails. These seem to correspond with the "second" comet.
Please give some help...
CS Peter
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There actually is a second comet in the same view at the moment. 🙂
Whow, ok, thank you, but why we have these different lenght in startrails?
@sternefueralle Looks like you imaged when the comet was close to C2022 U2 ATLAS, so a two for one. Little harder to process if their relative motion is different, so you likely need two separate comet registration integrations to add each of them to the final image maybe
@vincent-mod No, 30secs for all.
Interesting, maybe there was a rather big difference in quality between frames?
@vincent-mod I don't think so. It occured a meridian flip during the sequence. So there is a little timegap of 5 minutes when the flip happened.
Mm, maybe something happened there? Can you verify some frames after that are indeed 30 secs? The 5 min gap causes a pause in the star stripe so looking at the image the short stripes do line up with the longer one after that with similar brightness.
Hi Vincent, I worked on this strange behavior and now worked it out. Perhaps you'll find it interesting for you.
There was a time gap for meridian flip, around 5 Minutes.
Times: 19:04 - 20:16, 121 frames and 20:21 - 20:39, 30 frames. Each of them 30 secs, flats, darks, darkflat, all 30 secs.
I now stacked the frames with ASTAP and found, that there are two trails for the comet with this little gap. See first pic.
So it seems to me, that APP does not add the smaller part of the frames after the flip to the comet. So we see "two" comets, one ist the stacked one and the second, left of it, is all the rest after the flip. Not focused on. So we see "2" comets.
I answered all the questions in APP to mark the comet in the pictures, but allthough it was not stacked properly, on top of the first part of pics.
As you mentioned, there is a second comet in the same area. see pic 3. This we can see below the "main" comet at the bottom auf the pic, coming just into the pic. It is faint, but it is there.
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Thank you...
