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've computed the correct RGB white balance offsets for ASI585MC, and they work in GIMP but they do not work in APP: These amounts should produce a balanced image, and do in other software but not in APP.  Please allow these RGB multiplier to work to set the white balance (its says custom white balance), and to save as presets per camera.Â
Above that part you can select to use the camera white balance, doesn't that work?
Hi Skye @skysong,
Thank you very much for raising this to our attention.
I am wondering how you can calculate white balance values yourself. Can you share how you calculate this? A white balance in astronomical sense will definitely not be a fixed value for Red, Green and Blue, it depends on the actual data that you want to process, that is rather technical.
But that aside, it could be that the balance for your ASI585MC is also in the fits header and that would not be by definition a real white balance but rather a correction for the relative sensitivities of your camera's sensor in the different wavelengths, do you know if it is in there?, in the fits header I can check that and I can test for you what is going here and possibly fix this for you. Yes, presets for camera's can be a good addition, i agree.
Can you upload the data here and let me know once uploaded, then I will have a look and get back to you:
https://upload.astropixelprocessor.com/
username: uploadData
password:uploadTestData
Please make a folder with your name and issue like: Skye-WhiteBalance-ASI585MC
and upload your data there and let me know once done, thanks !
Above that part you can select to use the camera white balance, doesn't that work?
No that will not work, that is only applicable to camera Raw data, so images from Canon, Nikon, Sony etc... (see the popup menu).
Mabula
@mabula-admin Thank you, I will upload samples shortly.  I appreciate your taking a look at this. I calculated the white balance by looking at the QE charts for the camera itself, such as the green was 90%, blue 77%, and red 85%, so using these I've calculated a general color adjustments and they make the picture look much better, but they are not perfect. So if its supposed to be calculated on a per-image basis, I wonder why APP is not already doing this.
Mabula I have uploaded to the folder given for analysis. I have included RGB lights for photos 4..120 (3 were lost, different issue). These were stacked to single fits file by APP, also included and uploaded. These give the greenish results.Â
Hi Skye @skysong,
Thank you very much, we have received the upload in good order 😉 I have added your issue to my todo list so I will get back to you soon.
Mabula
