[fitsbits] BLANK keyword misinterpretation

[Steve Allen]

On Fri 2003-11-21T09:09:29 -0500, Arnold Rots hath writ:
> Shouldn't you also flip the sign bit?
> That's part of the traditional trick.

Yes.
Without that the data value in every pixel would be wrong.
With the BLANK value wrong it was only a few in 10000, and
randomly scattered, in most non-lab images.

--
Steve Allen          UCO/Lick Observatory       Santa Cruz, CA 95064
sla at ucolick.org      Voice: +1 831 459 3046     http://www.ucolick.org/~sla
PGP: 1024/E46978C5   F6 78 D1 10 62 94 8F 2E    49 89 0E FE 26 B4 14 93