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.
A probably stupid question ...
I'm trying to implement bias frames on top of light/dark / flats
I've shot lights and flats with different gains
So I have a set of bias frames according to light and "lightflats" images
and a set of bias frames associated to flat and darkflats
I don't know, in the initial file selection and loading process, how to associate bias with the regarding images, since i'm asked to select channels/ sessions rather than image type (light /flat)
Where am I wrong ?
clear skies
PS image collection detail (not sure it is useful) just in case
lights :
10 Halpha lights @gain 450 temp1 mapped to session 1
15 darks at gain 450 temp1 (same duration as lights above) mapped to session 1
then
5 Halpha lights @ gain 450 temp2 mapped to session 2
10 OIII lights @ gain 450 temp2 mapped to session 2
10 SII lights @ gain 450 temp2 mapped to session 2
15 darks @ gain 450 temp2 mapped to session 2
for each channel
15 flats + 15 darkflats per channel @ gain 120
Halpha frames mapped to session 1 & 2
OIII et SII frames mapped to session 2
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I did 50 bias at gain 450 and (block 1)
50 bias at gain 120 .. (block2)
but I don't know how to associate block 1 to lights and block 2 to flats (if it's possible)
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