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 am not sure how this happened, but running a mosaic using the settings I normally do has given me a very strange result. I have ran 4 different mosaics in the past couple weeks using the settings I did on this one, and those all turned out fine. I am using APP 2.0.0-beta4. Any idea what happened?
Here was the integration and registration settings
 Here was the result
If I need to I can upload the files used for this. I did each panel as an individual normal integration, then used the master lights as lights for the mosaic so I only had 4 each of SHO to do the integration, so a total of 12 lights.
@imnewhere Hi,
You need to increase the "scale start" to at least 5 and "scale stop" to at least 12 and probably 15 in tab 4. Also, in tab 3 you probably need to up the number of stars to 2500 or more. In tab 5 you need to enable advanced more. Try that please and let us know the result.
Wouter
It took me redoing each panel again one at a a time for it to finally work with those settings. Got some interesting errors in the meantime.
@imnewhere Sorry to read about the errors. Without more info about what data you were processing and in which stage APP was when those errors popped up, it will be impossible to explain what caused the error popups. I think the popup about the image dimensions speaks for itself, though.
@wvreeven the first image shows the dimensions of the images, the second happened right at registration, and the last 2 at the start of integration and in that order, though how it got confused with the dimensions I don't know since you can see they are definitely within a normal range and I wasn't using drizzle. I've done a drizzle integration on larger images than this before, and in fact most of my recent integrations were with a 2x drizzle on each panel because of major undersampling.
Here is the image I was working on: https://www.astrobin.com/m7zveu/
Each panel was in the 16mp range since the camera was an FLI ML16200, and I worked each panel to where I had a master Ha, Sii, and Oiii, so a total of 12 lights for 4 panels, each panel in one session. It ended up working, but it was strange that it didn't like the initial masters for each panel.
For instance, I did these using the same settings I posted in the first one. I didn't know about the advanced part on normilization.
https://www.astrobin.com/j50bmq/ https://www.astrobin.com/4ecd4t/ https://www.astrobin.com/k7trgh/ https://www.astrobin.com/qsjcwx/
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@imnewhere When imaging it is normal to have a slight drift that causes the final integration to have different dimensions than the raw lights. More so if you shoot mono images of the same target with different filters on different nights. The mount will never exactly return to the same position so the object will be displaced each night, causing the final registered integration results to have different dimensions again.
As for the popup, it doesn't indicate that APP got confused with the dimensions. It shows that APP has detected that your image is so large that it cannot be processed and needs to be scaled down.
Could you also try by switching off dynamic distortion correction?
@vincent-modÂ
I ended up closing out APP, then reopening it again and everything went well. Done a few more images since then and those turned out good too.
Ah, well that is weird for sure. If it happens again, please let us know.
