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.
So I've done some reading on the topic through out the forum, but I am still not very sure at how to tackle this particular function
Here is a stack (with LP removal and BG calibration already applied) of the Veil Nebula I attempted last night, would someone be kind enough to run me through Calibrate Star Colour function with this?
First of all, if you perform Light Pollution correction, Background calibration is done as well (changed some versions ago). You don't need to do Background Calibration separately after the Remove Light Pollution tool since it's done already 😉
This is what I get with the Star Color Calibration:
Please check this new video tutorial on star color calibration as well, it contains explanation on the parameters:
Can you share the details of this data capture? It seems that you might have used an LP filter or not?
which camera
which filters if any
which telescope
Star Color Calibration in principle with the Black Body and Extinction model needs Broadband RGB data. If you use a LP filter, the initial settins need to be changed quite bit..
First of all, if you perform Light Pollution correction, Background calibration is done as well (changed some versions ago). You don't need to do Background Calibration separately after the Remove Light Pollution tool since it's done already 😉
This is what I get with the Star Color Calibration:
Please check this new video tutorial on star color calibration as well, it contains explanation on the parameters:
Can you share the details of this data capture? It seems that you might have used an LP filter or not?
which camera
which filters if any
which telescope
Star Color Calibration in principle with the Black Body and Extinction model needs Broadband RGB data. If you use a LP filter, the initial settins need to be changed quite bit..
Mabula
hi Mabula thanks for the reply!
it is shot with a modified 760D (one of the low pass filters removed and replaced with baader clear glass) shot with sigma 135mm 1.8 art with STC astro-m LP filter in front, thanks!
it is shot with a modified 760D (one of the low pass filters removed and replaced with baader clear glass) shot with sigma 135mm 1.8 art with STC astro-m LP filter in front, thanks!
Star Color Calibration works best if you have broadband data. Such an LP filter will complicate star color calibration using black body physics. This means that you will need to be more aggresive with especially the slope parameters. They probably need to be much lower than the default values of 1.0 and 2.0. It can be as low as 0.4 and 1.0 depending on the filter and the used camera.
Download (St-avg-1492.0s-NR-x_1.0_LZ3-NS-full-eq-add-sc_BWMV_nor-AA-RL-MBB5_1stLNC_it1-mod-lpc-cbg-cbg.fits)
