Why are all images ...
Clear all

2023-03-15: APP 2.0.0-beta14 has been released !

IMPROVED FRAME LIST, sorting on column header click and you can move the columns now which will be preserved between restarts.


We are very close now to  releasing APP 2.0.0 stable with a complete printable manual...


Astro Pixel Processor Windows 64-bit

Astro Pixel Processor macOS Intel 64-bit

Astro Pixel Processor macOS Apple M Silicon 64-bit

Astro Pixel Processor Linux DEB 64-bit

Astro Pixel Processor Linux RPM 64-bit

Why are all images normalized?

2 Posts
2 Users
Main Sequence Star
Joined: 3 years ago
Posts: 22
Topic starter  


I'm currently trying to stack my first light images (Skywatcher Evostar 72ED) of M13. I have 100 lights and 30 darks and bias frames. The image quality is not very good due to the fact that I still waiting for my field flattener to arrive. To get something out of my images I only stack 70 out of 100 light frames but during the normalization process all 100 frames are processed. Why is this done if only 70 of them are used at the end? The quality score of an image is calculated during the calibration in step 2 so it is already there when the normalization process (step 5) starts and at the end (step 6) only 70 of my images are used for integration. 
For me it could have saved 30% of the time the normalization step took saving about 15 minutes or so. 

Maybe somebody could bring some light into this.

With best regards,


Topic Tags
Universe Admin
Joined: 6 years ago
Posts: 5368

The quality score does change when subsequent steps are processed, when APP knows more about the data because of those steps, things can change.