Registax 32 bit FIT files- why don't they work in other programs?

BSCALE = 1
BZERO = 32768
This is the 'key' one. The offset here should be 32768, for an
unsigned
_16bit_ FITs file. The result as it stands, will be that the image
will
have 2147483648 subtracted from the effective pixel values, and then
32768
added!. Try changing it to 2147483648, then saving the file _as
32bit_,
and reopening, or try simply selecting 'process', 'pixel math', havin
just
one image selected, and at the bottom of the page (add constant), put
in
2147450880 (2147483648-32768). You may then find the image appears OK.
Registax is being 'naughty', using the 32bit format as if it is
unsigned,
and then putting the wrong offset into here...

Still couldn't get it to work, Roger, so I have abandoned any further
workarounds. I have been down this road many times before, adding and
subtracting values, changing historgrams, etc, and was never able to
achieve
compatability. So, as Chris suggested, I'll just continue to stick with
the
16 bit FITs as they ARE compatable with most of my other images
programs.
Thank you in earnest for your suggestions, however.

Blaine
A pity.
I thought maybe I'd 'hit it' with the offset idea, but it sounds as if
something else if wrong as well.

Best Wishes

"Chris L Peterson" wrote in message
...
Lots of programs don't support 32-bit FITS. I know that Maxim does. Smart
programmers will use the free NASA fitsio library, and that will provide
full
FITS support for 32-bit and floating point formats.

Could you point me at a source of this, please Chris? My "SkyMap" program
only supports a very limited subset of FITS (basically that used by the
DSS/RealSky); it would be nice to be able to support more forms of it!

TIA for any assistance,

Regards,

Chris

On Sun, 22 Aug 2004 14:05:04 +0100, "Chris Marriott" wrote:

Could you point me at a source of this, please Chris? My "SkyMap" program
only supports a very limited subset of FITS (basically that used by the
DSS/RealSky); it would be nice to be able to support more forms of it!

Here you go: http://heasarc.gsfc.nasa.gov/docs/so...io/fitsio.html

If you want, you can work with the source, but the easiest thing is just to
include the library as a DLL with your app and not worry about the details.
Since this code is coming from people key to the maintenance of the FITS
standard, it evolves right along with the standard, and makes it easy for your
app to do the same.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

"Chris L Peterson" wrote in message
...
On Sun, 22 Aug 2004 14:05:04 +0100, "Chris Marriott"
wrote:

Could you point me at a source of this, please Chris? My "SkyMap" program
only supports a very limited subset of FITS (basically that used by the
DSS/RealSky); it would be nice to be able to support more forms of it!

Here you go: http://heasarc.gsfc.nasa.gov/docs/so...io/fitsio.html

If you want, you can work with the source, but the easiest thing is just
to
include the library as a DLL with your app and not worry about the
details.
Since this code is coming from people key to the maintenance of the FITS
standard, it evolves right along with the standard, and makes it easy for
your
app to do the same.


Thanks Chris - much appreciated!

Regards,

Chris