Hi,
ASTAP keeps only the master dark and master flat in memory. This means for sigma clip stacking the debayering is done three times on the same file.
An alternative would be to keep the result in memory or write them to disk.
Probably keep them in memory would be the fastest method but for a 4000x6000 pixels x3 colours x 32 bit image this is about 274 mbytes. So somebody running a computer with 16 gbyte memory this can quickly become too much to hold in memory.
Writing to disk 274 mbytes and read them later this will also take time. More then the reloading the orginal raw image of 4000x6000 pixels x1 colours x 16 bit equals 46 mbytes.
The speed of Sirl is impressive. I'm currently busy with some other thing but will consider new options to speed up ASTAP in 2 or 3 weeks.
Cheers, Han
Last edit: han.k 2025-03-14
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I have a question about stacking in ASTAP.
How does it work compared to Siril Astap because I miss the temporary files of the sequences (Debayerd, Calibrated/Solved, etc.)
Where does Astap store the files? Is there a temp directory and can I find it?
I haven't found these in Windows, Linux, or MacOS. The only files are the .CFG and the reslut.fit/s
CS
Hi,
ASTAP keeps only the master dark and master flat in memory. This means for sigma clip stacking the debayering is done three times on the same file.
An alternative would be to keep the result in memory or write them to disk.
Probably keep them in memory would be the fastest method but for a 4000x6000 pixels x3 colours x 32 bit image this is about 274 mbytes. So somebody running a computer with 16 gbyte memory this can quickly become too much to hold in memory.
Writing to disk 274 mbytes and read them later this will also take time. More then the reloading the orginal raw image of 4000x6000 pixels x1 colours x 16 bit equals 46 mbytes.
The speed of Sirl is impressive. I'm currently busy with some other thing but will consider new options to speed up ASTAP in 2 or 3 weeks.
Cheers, Han
Last edit: han.k 2025-03-14
No, please don't misunderstand me because I thought something similar.
Of course it would be better to keep everything in memory but that is not possible in the case of the ZWO Seestars.
Thank you for the explanation of the background.