Error converting PI xisf to fits ?

[Thomas Rudolph]

Hello,

I use Astap 2024.09.25 64bit, and try to convert Pixinsight .xisf image to fits.
Open file in Photometry tab, and choose 'Analyze' always gives error messages.

File is here
https://www.hamserver.de/astro/images/master.xisf

BTW, if I convert xisf to fits format myself in Pixinsight, which sample format should I use?
There are 8/16/32 integer/floating signed/unsigned options ... I tried some of them and got errors like "division by 0" from Astap.

Thanks and best regards,
Thomas

[han.k]

Hi Thomas,

The XISF is readable in the ASTAP viewer. You could save it again to FITS in the ASTAP viewer and then load in the photometry tab

I have investigate why it is failing in the photometry tab. I will do that later.

Since it is an already a -32 bit file you should select -32 bit format (floating point 32 bit)

The file is already in colour and seems the result of a stack or processing. This will make it less suitable for photometry. For accurate photometry you better use the original files. If stacking is required stack them in the ASTAP photometry tab. Do not convert to colour. Use/extract the green channel only.

Cheers, Han

[Thomas Rudolph]

Hi Han,

thanks for your hints, yes I'll try that.

CS
Thomas