Yes zstd+sh compressed xisf is 10MB vs uncompressed fits/xisf 32MB.
zlib+sh have good compression but it is slow. Even on my desktop Ryzen it takes seconds to compress.
lz4+sh is fast like fraction of second to compress one sub but compression ratio is not so good.
zstd+sh is best of both. Slight slower than LZ4 while almost as good compression ratio as zlib.
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KStars should be able to open XISF files. You can also use my FITS/XISF viewer nouspiro.space/?page_id=206
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Hello,
there is hidden feature in LibXISF that is used by INDI and KStars. That you can override compression when saving XISF files.
You can set LIBXISF_COMPRESSION environment variable to these values.
- zlib
- lz4
- lz4hc
- zstd
- zlib+sh
- lz4+sh
- lz4hc+sh
- zstd+sh
This set which compression method should be used. "+sh" variant are doing byte shuffling which further increase compression ratio. Best place is just open "~/.profile" file and add line new line
LIBXISF_COMPRESSION=zstd+shNext version of KStars will support ZSTD which have really nice compression ration where my Lights are 10MB instead of 32MB.
To utilize ZSTD you will need latest version of PixInsight. Also support for XISF is coming into Siril so next version after currently released 1.2.0 will have support for reading XISF files.
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Did you tried to load profile with ZWO Camera 1 and 2. Also if you have this camera can you enable debug logging and post these logs here?
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Main source of floating point inaccuracies comes when you do operation on numbers with vastly different magnitudes. For example if you try +1 to 20million you will end up with 20 000 002 because float can't represent 20 000 001.
But this errors pops up when you try calculate stddev from millions of pixels. 100x100 pixels should be just fine even with float.
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I bought Orange Pi5 8GB as miniserver for home use. It is much better than RPi4 and it have more performance than my 7year old laptop.
I installed 1TB nvme drive in it. I compiled INDI/KStars on it with my script and did some capturing with ASI camera. Download and save speed is comparable to my desktop PC. Also power draw is less than 5W (my power meter doesn't show anything less than 5W) which is IMHO interesting for battery guys.
HDMI dummy plugs can be necessary to be able reliably use VNC as without attached monitor there is no desktop to show. These mini PC tend to have build in dummy plug. So if it works then you don't need it.
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AFAIK you should use craft community.kde.org/Craft that is official way that KStars is build for windows.
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I would suggest to use or at least read my scripts that build INDI and Kstars. gitea.nouspiro.space/nou/astro-soft-build
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These error are when compiling tests. You can disable them with -DBUILD_TESTING=Off parameter when running cmake.
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