On Wed 2003/11/12 23:34:27 -0800, Steve Allen wrote
in a message to: FITSbits

It is not obvious how physical data values would be preserved and
documented when doing this. Most pretty pictures have been clipped,
stretched, mapped, and/or scaled in ways that obliterate physical
meaning in the data values.

Preserve physical data values? This image may help to clarify matters -
http://antwrp.gsfc.nasa.gov/apod/ap020920.html

At best this seems an awful lot like reinventing TIFF in FITS.
There should be strong justifications before doing this.

Can TIFF put a celestial coordinate grid on the above image?

Mark Calabretta
ATNF