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 stacked 29X180 sec subs with darks, flats and dark flats in APP.  The smaller stars in the stacked image are purple.  I used the exact same data in DSS and the stars look normal.  What is the problem?
Camera is the 2600MC.  I also needed to force debayer on the subs. I thought APP would recognize the data as color subs automatically?  The images below are with 15% stretch.
Thanks
that's interesting. i am having a similar problem with my unmodified dslr, canon 6d. Â
@stephanhamel22 Hi Stephan. There are several factors that can influence the star colors. Can you tell us more about the data you're using, particularly the flats? How did you take them? What was the light source? Was any filter involved? As for the other images, are the gain, offset and temperature for all the same?
Regarding the automatic recognition of color data: if the application you use to shoot the images includes the Bayer pattern in the FITS header of the file then APP can detect that. Some application do not include the Bayer pattern in the FITS header and in that case APP needs to be told how to debayer the images.
Hi, any solutions for this issue?
