Dear list,
on the map display of the GRASS gui is very easy to get a transparency
effect on a layer, but I have been trying to do it exclusively by command
line to script a task and I didn’t success. Does anyone know how can I solve
this issue? The aim is to add a semi-transparent layer with climatological
information above a terrain raster.
Thanks in advance,
José A. Ruiz
José Antonio Ruiz Arias wrote:
on the map display of the GRASS gui is very easy to get a transparency
effect on a layer, but I have been trying to do it exclusively by command
line to script a task and I didn’t success. Does anyone know how can I solve
this issue? The aim is to add a semi-transparent layer with climatological
information above a terrain raster.
If you want the end result as an image, you can use the same mechanism
as gis.m uses, i.e. generate each layer as a PPM/PGM pair using the
PNG driver then combine them with g.pnmcomp.
If you need the result as a map, so that you can use it as a
background in an X monitor, use r.blend.
--
Glynn Clements <glynn@gclements.plus.com>
José Antonio Ruiz Arias wrote:
on the map display of the GRASS gui is very easy to get a transparency
effect on a layer, but I have been trying to do it exclusively by
command line to script a task and I didn't success. Does anyone know
how can I solve this issue? The aim is to add a semi-transparent layer
with climatological information above a terrain raster.
see the d.shadedmap script in gui/tcltk/gis.m/script/
which calls this:
d.his "h_map=$GIS_OPT_DRAPEMAP" "i_map=$GIS_OPT_RELIEFMAP"
Hamish
You must render your maps out to *.PPM files with *.PPG mask files. Then you
can composite them with g.pnncomp. You can look in mapdisp.tcl to get an
idea of how to do it.
Michael
On 3/21/07 1:54 PM, "José Antonio Ruiz Arias" <jararias@ujaen.es> wrote:
Dear list,
on the map display of the GRASS gui is very easy to get a transparency
effect on a layer, but I have been trying to do it exclusively by command
line to script a task and I didn¹t success. Does anyone know how can I solve
this issue? The aim is to add a semi-transparent layer with climatological
information above a terrain raster.Thanks in advance,
José A. Ruiz
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University
phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton
Just note, which does not help you yet:
this should be a feature of the new wx gui..
jachym
2007/3/21, José Antonio Ruiz Arias <jararias@ujaen.es>:
Dear list,
on the map display of the GRASS gui is very easy to get a transparency
effect on a layer, but I have been trying to do it exclusively by command
line to script a task and I didn't success. Does anyone know how can I solve
this issue? The aim is to add a semi-transparent layer with climatological
information above a terrain raster.Thanks in advance,
José A. Ruiz
_______________________________________________
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grassuser@grass.itc.it
http://grass.itc.it/mailman/listinfo/grassuser
--
Jachym Cepicky
e-mail: jachym.cepicky gmail com
URL: http://les-ejk.cz
GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
I've been trying to create the PPM/PGM pair with the PNG driver. Using the next commands I get the ppm file:
export GRASS_TRUECOLOR="TRUE"
export GRASS_WIDTH=642
export GRASS_WIDTH=371
export GRASS_PNGFILE=mde.ppm
d.mon start=PNG
d.mon select=PNG
d.rast map=mde
d.mon stop=PNG
But doing the same for the pgm file I get an error message. I have looked for some specific command in GRASS to create de pgm but I haven't found it. Also looked for the mapdisp.tcl to take it a look but I don't have it in my system (at least that's what I think). So I finally used the convert tool (ImageMagic utility) to generate the pgm from the ppm and then I composited with g.pnmcomp, but the result is not as nice as using GRASS.
So, any shortcut to solve the problem inside GRASS?
Thanks in advance
-----Mensaje original-----
De: Glynn Clements [mailto:glynn@gclements.plus.com]
Enviado el: miércoles, 21 de marzo de 2007 23:44
Para: José Antonio Ruiz Arias
CC: grassuser@grass.itc.it
Asunto: Re: [GRASS-user] Adding a semi-transparent layerJos・Antonio Ruiz Arias wrote:
> on the map display of the GRASS gui is very easy to get a transparency
> effect on a layer, but I have been trying to do it exclusively by
command
> line to script a task and I didn稚 success. Does anyone know how can I
solve
> this issue? The aim is to add a semi-transparent layer with
climatological
> information above a terrain raster.If you want the end result as an image, you can use the same mechanism
as gis.m uses, i.e. generate each layer as a PPM/PGM pair using the
PNG driver then combine them with g.pnmcomp.If you need the result as a map, so that you can use it as a
background in an X monitor, use r.blend.--
Glynn Clements <glynn@gclements.plus.com>
__________ Informaci
José Antonio Ruiz Arias wrote:
I've been trying to create the PPM/PGM pair with the PNG driver. Using the next commands I get the ppm file:
export GRASS_TRUECOLOR="TRUE"
export GRASS_WIDTH=642
export GRASS_WIDTH=371
export GRASS_PNGFILE=mde.ppmd.mon start=PNG
d.mon select=PNG
d.rast map=mde
d.mon stop=PNGBut doing the same for the pgm file I get an error message. I have
looked for some specific command in GRASS to create de pgm but I
haven't found it.
Add:
export GRASS_TRANSPARENT=TRUE
This will cause a PGM file to be written out in addition to the PPM
file. The PGM file contains the mask.
Also looked for the mapdisp.tcl to take it a look
but I don't have it in my system (at least that's what I think).
The file which performs the compositing is etc/gm/mapcanvas.tcl.
--
Glynn Clements <glynn@gclements.plus.com>
Seems to work fine. Thanks a lot Glynn. 
________________________________
José A. Ruiz Arias
Departamento de Física
Escuela Politécnica Superior
Edificio A-3, Campus Lagunillas
Universidad de Jaén
23071 Jaén Spain
Tlf. +34 953212474
Email: jararias@ujaen.es
_____________________________________
-----Mensaje original-----
De: Glynn Clements [mailto:glynn@gclements.plus.com]
Enviado el: jueves, 22 de marzo de 2007 15:19
Para: José Antonio Ruiz Arias
CC: grassuser@grass.itc.it
Asunto: RE: [GRASS-user] Adding a semi-transparent layerJosé Antonio Ruiz Arias wrote:
> I've been trying to create the PPM/PGM pair with the PNG driver. Using
the next commands I get the ppm file:
>
> export GRASS_TRUECOLOR="TRUE"
> export GRASS_WIDTH=642
> export GRASS_WIDTH=371
> export GRASS_PNGFILE=mde.ppm
>
> d.mon start=PNG
> d.mon select=PNG
> d.rast map=mde
> d.mon stop=PNG
>
>
> But doing the same for the pgm file I get an error message. I have
> looked for some specific command in GRASS to create de pgm but I
> haven't found it.Add:
export GRASS_TRANSPARENT=TRUEThis will cause a PGM file to be written out in addition to the PPM
file. The PGM file contains the mask.> Also looked for the mapdisp.tcl to take it a look
> but I don't have it in my system (at least that's what I think).The file which performs the compositing is etc/gm/mapcanvas.tcl.
--
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