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.
Hello. I finally got a stacked image from APP! But, I don't understand how to polish it. The attached image is IC1805, 20 300sec exp at 0 gain with an ASI2600MC via an 80ED. Specifically, the star calibration didn't help my stars colors (maybe it doesn't do that?) and the overall red-hue is more than the nebulosity. Any tips? Thank you for your time.
The "overall red hue" seems fine to me - this region is actually all over with faint ha emissions...
Your stars are that bloated because they seem to be saturated (they ar full white in the middle and have big halos), dont know your camera setting - but i got a imx571 osc too and 300s does saturate bright stars even in low gain mode.
your blue channel seems to bloat more, this can be your scope optics or (is your camera with uv/ir filter?) you could use a tigher uv/ir cut filter. Maybe you had some misty air this can bloat to.
Could be many more reasons, first i simply would use some shorter exposure time, thats the main issue...
Hello. I finally got a stacked image from APP! But, I don't understand how to polish it. The attached image is IC1805, 20 300sec exp at 0 gain with an ASI2600MC via an 80ED. Specifically, the star calibration didn't help my stars colors (maybe it doesn't do that?) and the overall red-hue is more than the nebulosity. Any tips? Thank you for your time.
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Hi Tyler,
I agree with Sebastian, the region is actually full with H-alpha signal, so it is actually good that it is revealed by your data.
Did you expose 300seconds without any filter? Or did you use a light pollution filter perhaps?
The Star Color Calibration tool should actually give you accurate star colors. Maybe Sebastian has a good point, the stars might be too saturated. Solution can be to expose shorter for your next object, or when you use the Star Color Calibration tool, try to select areas with a star population that is not clearly affected by the H-alpha nebulosity and that contains no or little bright and saturated stars. Then the result should be good.
