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
I encountered an issue with registration during multi-channel mosaic, mainly due to the high RMS value, which caused the stars in the final image to not match and resulting in ghosting.
My device is Sony A7, and I have taken a total of 7 photos in a row using Tamron 17-28.H-alpha. 21 RGB shots were taken in 3 rows, with 7 shots per row.The focal length when I was shooting was 17mm
I carefully set up everything that can be set according to the forum tutorial.
For example, star recognition tested from 500 to 8000
The registration model has been tested for triangles, quadrilaterals, and pentagons, and dynamic distortion calibration has also been tested on or off. The same camera has also been tested on and off.
Registration mode selection mosaic.
I have tested all the above settings and the results are that the RMS value is too high. In some cases, the RMS value is over 100, and in others, the RMS value can reach tens of thousands, making it impossible to register.
In addition, I also tested that if I only perform RGB mosaic registration alone, it seems to yield normal results, but as soon as H-alpha is added for multi-channel mosaic registration, it fails.
Using the same settings, it was normal for me to use another set of RGB and H-alpha photos before.
I have been unable to find the reason. Can you help me check where the problem lies? Thank you!
I have uploaded the information for this trip to Google Cloud Drive
RGB。 https://drive.google.com/drive/folders/1o5_aHYEs2ng-Hi3WbamJhh-gubaLiPVB?usp=sharing
H-α。 https://drive.google.com/drive/folders/1Ic4VxnDTtYnQOf0YDj1sreo1BApqYXL2?usp=sharing
Hi @gaox1122,
Thank you for sharing your issue and your data, I will try to solve this in the coming days 😉 and will report back as soon as possible.
Mabula
Hi Xiang @gaox1122,
It took some time, but I have tested now your data in the upcoming 2.0.0-beta39 release with a much improved registration engine and I am glad to announce that all is working perfectly now on your data. I can register the RGB and H-alpha data at the same time in multi-channel mode.
In 3) Analyse stars i used only 1000 stars, the new registration engine is way more robust and smart and less stars are needed now to get registration working without issues/errors.
I get a mosaic registration result of mlosaic 0,61 - 19932, so RMS is only 0,61 pixel using 19932 star pairs in the mosaic.
I have implemented several new projections as well. This is your RGB data with Hammer-Aitoff projection. Please note the much simple 4) Register menu in 2.0.0-beta39.
Apologies that it took so long to solve this, but I have worked extensively in the last couple of months to release a very big update now with 2.0.0-beta39. I will try to release it within 1-2 weeks time.
Finally, the data that you uploaded is in TIFF format and thus already stretched. That makes it harder for APP to process it, since in all of APP, the algorithms assume linear data and that keeps post processing options fully open. Once stretched, the flexibility in post processing drops big time. Star analysis for instance works much better on linear data, the star centroids will be more precise. Thus registration will be more precise and robust. But gladly, APP can now process this without issue into a mosaic.
Mabula
