Re: .pgm files

[Matthew M Murphy]

Matt,

Thanks for the helpful advice.  However, I am not able to edit the files
using xv, nor am I able to install netpbm on my machine due to some
conflicts.   Do you know if it is possible to create  acceptable (accept
for the comment info) files using gimp?  If it is possible, I would much
appreciate a description of how to get gimp to create the correct kind of
file.  Even when I save a file as ascii and grayscale, I still do not end
up with the correct format.

-=- Matt



***********************************************************************
*     Matthew M. Murphy                                               *
***********************************************************************
* "... we are often distressed by the hard edge of determinacy        *
* our verbal output substitutes for the fuzziness of our convictions" *
*                               - Daniel C. Dennett                   *
***********************************************************************

On Wed, 9 Dec 1998, Matt Aylward wrote:

> Matt,
> I use .pgm files a great deal in my simulations for transfering GIS data
> in and out of Swarm. I usually use "xv" or a plain text editor for
> editing. 
> There are some problems you should be aware of:
> 
> 1) Most editing programs, including xv, add comment lines beginning with
> a "#". The Swarm pgm-to-Discrete2d methods do not deal with these
> comments at all, so they cause an error and your simulation will bail
> out. I have been meaning to write a fix for this but havn't had time.
> For now I just delete all comment lines before using the pgm file in
> Swarm.
> 
> 2) Many programs automatically convert an ASCII pgm to a RAW (binary)
> pgm when you open it (e.g., ImageMagik does this). Again this will kill
> your simulation. So be sure to specifically save as ASCII, and remove
> the comment lines.
> 
> Netpbm are definately has the best C libraries and command-line programs
> for manipulating ASCII pgms, but of course the do not have the
> interactive interfaces.
> 
> If you have any specific problems, let me know.
> I have written a number of methods to work between pgm's and
> Duscrete2d's, e.g., to set the world size of the simulation to the size
> of an input pgm file. If anything like this might be useful then let me
> know.
> 
> Cheers,
> Matt
> ps if you don't get an immediate reply from me be patient, I am doing a
> lot of writing at home at the moment where I have no internet
> connection. So I may not see email for a few days.
> -- 
> Matt Aylward: <address@hidden> or <address@hidden>
>          Linux Lover - OS for the people by the people.
>         ******~~~~~May the Swarm be with you.~~~~~******
>        Depts of Geography (GIS) and Botany (Marine), UWA
> 
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> 


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