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.
For some reason I cannot fathom, I am getting odd results at the bottom of the frame during integration, but only on some channels. Specifically, the Ha channel.
If I take two calibrated FITS using the Ha filter, (both of which appear like this):
Then load them, analyze them, register them, normalize them, and finally integrate them, I receive this:
Where the bottom becomes brighter/lighter.
Both the FITS were taken in the same session on the same instrument, one immediately after the other.Â
I suspect it is a processing issue with me, but for the life of me I can't figure it out.
I would be most grateful for any suggestions.
Thank you!
david
Can you give us a little more info about the equipment you use and what images you have taken with them? What camera do you use? Darks, Bias, flats, dark flats? Or are you reusing masters that you have taken before?
I was able to correct the lightness by turning off the LNC. I don't know why I had overlooked that before.
Thank you,
david
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Mm, LNC shouldn't be a problem I think. It could be that if you look very closely to both images before combining them, giving them a big stretch to compare the backgrounds of both, you might see a difference where LNC is trying to correct it. Both images are corrected with proper bias and such right?
