error file Fits Sbig

[Giorgio]

Hello
in trying to save a file fits-Sbig, always in fits format, I get this error.
If instead you save in Tif's okay. Why?
thanks,
Giorgio.

[Philip de Louraille]

FFFFFFB0 converts to ÿÿÿ°

If I were you, I'd look under Files | FITS Header and see what's written and if that value is correct. My guess is not...
It is probably a value that PixInsight uses to evaluate signal or noise.

[Philip de Louraille]

Then again... FFFFFFB0 converts as a number to 4294967216 which is 2^32 - 80...

[Giorgio]

thanks Philip
Can you see it?

[bitli]

A wild guess, try to change or remove the OBSERVER NAME, as the value has a single quote. My Guess is that it may have 'Obervers's name' in the comment and that this COULD be misinterpreted by the fits io.
-- bitli

[georg.viehoever]

Maybe it is the degree symbol in the file name.

[Giorgio]

Great Bitli, Great Giorg.
Both words D F Observer
Thank you very much.
Ciao,
Giorgio

[Philip de Louraille]

I see the answer was written as I was looking.
I was thinking that it was either the ° symbol or the "s Name'" comment field...

However the fact that PI could not save the file may be a bug in the FITS interpreter?

[Giorgio]

Thanks Philip.
Giorg

[Juan Conejero]

However the fact that PI could not save the file may be a bug in the FITS interpreter?

Not at all. It is a bug in the software that has generated the original FITS file. A degree symbol is illegal in a FITS header because the FITS standard only allows ASCII characters (in the DARK-IMG keyword). To prevent propagation of nonstandard FITS files, our FITS support module allows loading the image, but not writing it until the header is fixed.

[Philip de Louraille]

Hi Juan,
I was thinking that rather than output a cryptic note having FFFFFFB0 in it, PI could state that a non-ASCII character was found it it and state what it is, in this case °?
Might be a tad more helpful to the masses. ;-)

[bitli]

The name of the key would be nice too.

For information, the following page: http://fits.gsfc.nasa.gov/fits_verify.html or program: http://heasarc.gsfc.nasa.gov/docs/software/ftools/fitsverify/ may be useful to validate FITS file. I am not sure how useful the error messages are, but may be worth trying in case of problem.

-- bitli