GRASS mailing list alive

GRASS GRASS user
1

Dear GRASS Community,

obviously the GRASS list is back! Great!

Please note:

The GRASS 4.2.1 Web-Server has got a new address:

    Bereich Geographie – Naturwissenschaftliche Fakultät – Leibniz Universität Hannover

Now I concentrate all my activities onto my institute's server.
The mirrors will remain active certainly and the FTP-Server
here also. Physically the FTP-Server and the Web-Server are
identical now.

For some time the old www.laum.uni-hannover.de - pages will
be kept, so it should be a smooth migration.

   Markus Neteler

---------------------------------------------------------------------
Geographisches Institut | Institute of Geography
   Physische Geographie Physical Geography
& Landschaftsoekologie & Landscape Ecology
Universitaet Hannover University of Hannover, Germany
                     neteler@geog.uni-hannover.de
             Bereich Geographie – Naturwissenschaftliche Fakultät – Leibniz Universität Hannover
----------------------------------------------------------------------

2

Hi everybody,

I have a query I am hoping someone can help with. I have a series of old
color photographs of an area which I need to scan and study to see how it
has changed. Is there any algorthm to convert a composite color photograph
into individual RGB intensities? Is there a unique way of doing so? Or
even a heuristic which may have some (hopefully estimatable) degree of
error in back-converting? How do people usually deal with this?

Thanks,

Harini Nagendra

3

At 02:49 PM 8/17/98 -0700, you wrote:

Hi everybody,

I have a query I am hoping someone can help with. I have a series of old
color photographs of an area which I need to scan and study to see how it
has changed. Is there any algorthm to convert a composite color photograph
into individual RGB intensities? Is there a unique way of doing so? Or
even a heuristic which may have some (hopefully estimatable) degree of
error in back-converting? How do people usually deal with this?

Thanks,

Harini Nagendra

One of the features of the r.mapcalc program is a function that extracts
the color
components ( red, green and blue) of a raster file. the syntax is:

         r.mapcalc red_output_map = r#input_map
         r.mapcalc green_output_map = g#input_map
         r.mapcalc blue_output_map = b#input_map

------------------------------------
Leslie Apollon, M.Sc. Conseiller SIG - Support Technique

Global Geomatics Inc.(formerly L.A.S. Inc.)
1600, Boul. St-Martin Est, tel:(450) 668-4949 poste 201
bureau 650, Tour A fax:(450) 668-2822
Laval, Québec, Canada
H7G 4R8

On the Web: http://www.globalgeo.com

4

Markus Neteler wrote:

Dear GRASS Community,

obviously the GRASS list is back! Great!

I wrote the attached mail yesterday... and see nothing coming back
from listserv... Did you have a better connection than me ?
or at least your opinion about my projects ?

Bye
--
Michel Wurtz ENGEES - Laboratoire Territoires & Environnement
                1, quai Koch - BP 1039, F-67070 STRASBOURG cedex
                Tel: +33 03.88.25.34.62 Fax: +33 03.88.37.04.97