From fitz@noao.edu Mon May  4 09:46:03 1992
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Newsgroups: sci.astro.fits
Organization: National Optical Astronomy Observatories, Tucson, AZ, USA
From: fitz@noao.edu (Mike Fitzpatrick)
Subject: Re: SAOimage and FITS
Date: Sun, 3 May 1992 08:24:43 GMT

Hi Ryan,
	Basically the is no way to change the command's behavior using other
flags/switches/whatevers.  A quick tour of the code (I can't actually display an
image from my terminal right now) shows that the image scale map is reset for 
the new image, but I'm not sure whether what you want it to do (or what you 
are seeing) is to rescale the display based on the new image min and max, or 
preserve the old transformation.  You could try looping over each image as in:

	% foreach i (*.fts)
	>    saoimage -fits $i:r.fts
	> end

to display the images scaled individually (is this what you want?).  If you've
changed the scaling by moving the mouse and want to preserve that somehow you
might try playing with the [r]min/[r]max switches to define a specific trans-
formation for each image.
	In general the IRAF group is supporting SAOimage so questions may be
directed to iraf@noao.edu, although we do monitor this group.  I hope this
helps.

Mike Fitzpatrick
NOAO/IRAF Group
fitz@noao.edu  or  5355::fitz

From alberto@cfa203.HARVARD.EDU Tue Mar  9 16:34:19 1993
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	["1224" "" "9" "March" "93" "18:44:50" "GMT" "Alberto Accomazzi" "alberto@cfa203.HARVARD.EDU " nil "29" "Re: Negative bitpix values and SAOIMAGE" "^From:" nil nil "3"])
Newsgroups: sci.astro.fits
Organization: Smithsonian Astrophysical Observatory, Cambridge, MA,  USA
From: alberto@cfa203.HARVARD.EDU (Alberto Accomazzi)
Subject: Re: Negative bitpix values and SAOIMAGE
Date: 9 Mar 93 18:44:50 GMT

>From article <1nfpoqINNiok@mailgzrz.TU-Berlin.DE>, by gottsch@mikro.ee.tu-berlin.de (Gert Gottschalk):
> Hi there,
> 
> I am using saoimage (under X11r5) to view fitsimages. Now it seems that
> the 16 Bit that saoimage reads are signed (-32768 ... +32767). This gives
> me some trouble with colormaps and their manipulation. (I can't get to
> a Backgroundsignal of 0) 

Did you try
$ saoimage -fits -min 0 -max 32767 -linear file.fits
(you can make the max be whatever you want to be).
If you want to interpret the data as unsigned (overriding the standard
FITS interpretation) you can try:
$  saoimage -u2 cols rows -min min_val -max max_val -skip header_size file.fits
where header_size is a multiple of 2880.

> Is there a simple tool that eats fits format tells me the pixelrange and
> transforms this range into a usersupplied new range (preferrably linear) 
> and writes out a new fits file with the new range ?

IRAF can do that.  Look at the help pages on imstatistics and imarith
in the images package.

 - Alberto

==========
Alberto Accomazzi              Harvard-Smithsonian Center for Astrophysics
alberto@cfa.harvard.edu        60 Garden Street, MS 39
(617) 495-7076                 Cambridge, MA  02138  USA

From fitz@noao.edu Tue Mar  9 16:35:51 1993
Status: RO
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	["544" "Tue" "9" "March" "1993" "19:13:42" "GMT" "Mike Fitzpatrick" "fitz@noao.edu " nil "13" "Re: saoimage: Is there documentation?" "^From:" nil nil "3"])
Newsgroups: sci.astro
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Organization: National Optical Astronomy Observatories, Tucson, AZ, USA
From: fitz@noao.edu (Mike Fitzpatrick)
Subject: Re: saoimage: Is there documentation?
Date: Tue, 9 Mar 1993 19:13:42 GMT

>From article <1nifvv$dcu@vela.acs.oakland.edu>, by mje@pookie.pass.wayne.edu (Michael J. Edelman):
> I have a copy of saoimage, but somehow I filed to find any documentation
> for it. (I downloaded a binary.) Can someone direct me to docs or source?

	Source for SAOimage can be found on iraf.noao.edu (140.252.1.1) in
the iraf.old directory as "saoimage.tar.Z".  This is the latest version 
(V1.07), the doc subdirectory probably has what you need (misc hints, man 
page, and a User's Guide).


Mike Fitzpatrick
NOAO/IRAF Group
fitz@noao.edu