Mar 28 2026 APP 2.0.0-beta40 will be released in 7 days.
It did take a long time to have the work finished on this and it will have a major performance boost of 30-50% over 2.0.0-beta39 from calibration to integration. We extensively optimized many critical parts of APP. All has been tested to guarantee correct optimizations. Drizzle and image resampling is much faster for instance, those modules have been completely rewritten. Much less memory usage. LNC 2.0 will be released which works much better and faster than LNC in it's current state. And more, all will be added to the release notes in the coming weeks...
Update on the 2.0.0 release & the full manual
We are getting close to the 2.0.0 stable release and the full manual. The manual will soon become available on the website and also in PDF format. Both versions will be identical and once released, will start to follow the APP release cycle and thus will stay up-to-date to the latest APP version.
Once 2.0.0 is released, the price for APP will increase. Owner's license holders will not need to pay an upgrade fee to use 2.0.0, neither do Renter's license holders.
Hello
Can I create a color image only for O3 with APP?
I photographed the squid star cloud, and it is well shown in monochrome images.
LRGBHOO synthesis does not have the color of the squid star cloud.
So I want to see the color image of O3 alone.
May the night be sunny
@mo-mo If you only use the OIII channel then the data by definition is mono. The pass band of the OIII filter is so small that is effectively eliminates any color information. In order to get a color image you need to at least combine OIII with an Ha (or R) image.
The lack of color in the LRGBHOO image may be due to the contribution of L. Adding that generally tends to wash out colors. Do you get colors if you create an RGBHOO image instead? If it does then we can help you add L as well while maintaining color.
HTH, Wouter
Thanks for the answer.
I tried RGBHOO.
Compared to LRGBHOO, the color of O3 is better, certainly.
And then I realized that I had encountered a new challenge. In other words, the entire image is biased toward bluish-green because the color of O3 is strong in all regions.
I think this is correct in principle, but I don't know how to emphasize only the squid nebula. It would be nice if the APP had a function for this.
thanks in advance
@mo-mo I am not sure what you mean with "emphasize" but if you mean "use a mask" then this is not possible (yet, I think) in APP. If you upload your L, R, G, B, Ha and OIII images then we can try and help you get the most out of it. Without any example it is hard to give you advice.
Wouter
hello
I uploaded six files to the folder.
I would be very grateful if you could give me some advice.
Thank you
@mo-mo Thanks for uploading the images.
The signal of the Bat Nebula in L is very low and the Squid is completely absent, which is why the colors become very pale when you use it. The signal of the Bat Nebula and particularly the Squid are very low in R, G and B, which is why they don't become very visible when combining all RGBHaOIII images. So you probably get the best result by
- Combining the R, G and B images into an RGB image.
- Combining the Ha and OIII images into an HOO image.
- Reducing the size of the stars in the HOO image.
- Combine the RGB and HOO images such that the star colors of the RGB image and the nebulae of the HOO image are used.
There are several posts on this forum that explain how to do that.
Wouter
