Re: [GRASS-user] rasters loaded with r.external miss a colour table?
Paolo wrote: Sorry I was unclear: importing the map results in an automatically nicely coloured map, whereas r.external results in a greyscale. Markus N wrote: Probably r.external is presetting instead a grey-scale color table? yes, it is doing that, see main.c line ~ 340. if gdal supplies a color table it uses it, otherwise r.external checks if the map is type GDT_Byte and if so applies the grey255 rules. Or, if some other data type applies G_make_grey_scale_colors() based on the range. I would suggest that this be changed to not create any color table if none is provided. (and so act like other grass modules do in that case and fall back to rainbow rules) Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
On Fri, Feb 24, 2012 at 9:24 AM, Hamish hamis...@yahoo.com wrote: Paolo wrote: Sorry I was unclear: importing the map results in an automatically nicely coloured map, whereas r.external results in a greyscale. Markus N wrote: Probably r.external is presetting instead a grey-scale color table? yes, it is doing that, see main.c line ~ 340. if gdal supplies a color table it uses it, otherwise r.external checks if the map is type GDT_Byte and if so applies the grey255 rules. Or, if some other data type applies G_make_grey_scale_colors() based on the range. I would suggest that this be changed to not create any color table if none is provided. (and so act like other grass modules do in that case and fall back to rainbow rules) +1 (then it becomes again the least surprise approach) Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
Il 24/02/2012 09:24, Hamish ha scritto: yes, it is doing that, see main.c line ~ 340. if gdal supplies a color table it uses it, otherwise r.external checks if the map is type GDT_Byte and if so applies the grey255 rules. Or, if some other data type applies G_make_grey_scale_colors() based on the range. I would suggest that this be changed to not create any color table if none is provided. (and so act like other grass modules do in that case and fall back to rainbow rules) ok, thanks a lot for clarifying. all the best. -- Paolo Cavallini See: http://www.faunalia.it/pc ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
Hamish wrote: if gdal supplies a color table it uses it, otherwise r.external checks if the map is type GDT_Byte and if so applies the grey255 rules. Or, if some other data type applies G_make_grey_scale_colors() based on the range. I would suggest that this be changed to not create any color table if none is provided. (and so act like other grass modules do in that case and fall back to rainbow rules) Note that r.in.gdal behaves similarly: if the input file lacks a colour table, it creates a 0..255 grey-scale table for GDT_Byte, and a range-based grey-scale table for GDT_UInt16. It may be desirable to keep the two consistent. OTOH, r.in.gdal has a longer history than r.external (i.e. it's more likely that someone is relying upon the existing behaviour of r.in.gdal than is the case for r.external). -- Glynn Clements gl...@gclements.plus.com ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] rasters loaded with r.external miss a colour table?
Hi all. Importing a dtm raster assign a correct colour table to it. If I load it with r.external, instead, only a greyscale is applied. This happens through the qgis plugin, do not know if it's the same with other interfaces). Is this a known issue? All the best. -- Paolo Cavallini See: http://www.faunalia.it/pc ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
On Thu, Feb 23, 2012 at 12:03 PM, Paolo Cavallini cavall...@faunalia.it wrote: Hi all. Importing a dtm raster assign a correct colour table to it. Which format do you have? For example, GeoTIFF has only limited color table support. If I load it with r.external, instead, only a greyscale is applied. This happens through the qgis plugin, do not know if it's the same with other interfaces). Which operating system and which GRASS version? Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
Il 23/02/2012 14:04, Markus Neteler ha scritto: On Thu, Feb 23, 2012 at 12:03 PM, Paolo Cavallinicavall...@faunalia.it wrote: Hi all. Importing a dtm raster assign a correct colour table to it. Which format do you have? For example, GeoTIFF has only limited color table support. adf (the same raster when imported has its nice colormap). Which operating system and which GRASS version? Debian testing, official package: 6.4.1-2 Thanks. -- Paolo Cavallini See: http://www.faunalia.it/pc ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
On Thu, Feb 23, 2012 at 12:03 PM, Paolo Cavallini cavall...@faunalia.it wrote: Hi all. Importing a dtm raster assign a correct colour table to it. If I load it with r.external, instead, only a greyscale is applied. Do you use r.colors? This happens through the qgis plugin, do not know if it's the same with other interfaces). Is this a known issue? I tried in GRASS: # quick and dirty test: GRASS 6.4.3svn (latlong_wgs84):~/data/maps/fao_forest_fra2000/frst_gez r.external /home/neteler/data/maps/fao_forest_fra2000/frst_gez/w001001.adf out=test WARNING: Datum Not_specified_based_on_Clarke_1866_ellipsoid not recognised by GRASS and no parameters found Projection of input dataset and current location appear to match Importing band 1 of 1... Link to raster map test created GRASS 6.4.3svn (latlong_wgs84):~/ g.region rast=test -p projection: 3 (Latitude-Longitude) zone: 0 datum: wgs84 ellipsoid: wgs84 north: 90N south: 90S west: 180W east: 180E nsres: 0:00:32.4 ewres: 0:00:32.4 rows: 2 cols: 4 cells: 8 GRASS 6.4.3svn (latlong_wgs84):~/ r.colors test col=gyr Color table for raster map test set to 'gyr' GRASS 6.4.3svn (latlong_wgs84):~/ d.mon x0 GRASS 6.4.3svn (latlong_wgs84):~/ d.rast test The map is nicely colorized. I did not try in QGIS. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
Il 23/02/2012 14:57, Markus Neteler ha scritto: On Thu, Feb 23, 2012 at 12:03 PM, Paolo Cavallinicavall...@faunalia.it wrote: Hi all. Importing a dtm raster assign a correct colour table to it. If I load it with r.external, instead, only a greyscale is applied. Do you use r.colors? This happens through the qgis plugin, do not know if it's the same with other interfaces). Is this a known issue? I tried in GRASS: # quick and dirty test: GRASS 6.4.3svn (latlong_wgs84):~/data/maps/fao_forest_fra2000/frst_gez Sorry I was unclear: importing the map results in an automatically nicely coloured map, whereas r.external results in a greyscale. Apparently r.in.gdal applies automatically an appropriated colour map, r.external does not. All the best. -- Paolo Cavallini See: http://www.faunalia.it/pc ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] rasters loaded with r.external miss a colour table?
On Fri, Feb 24, 2012 at 7:15 AM, Paolo Cavallini cavall...@faunalia.it wrote: Sorry I was unclear: importing the map results in an automatically nicely coloured map, whereas r.external results in a greyscale. Ah, this is a different issue then. Apparently r.in.gdal applies automatically an appropriated colour map, r.external does not. GRASS, in case that no color table is present, applies the rainbow color table. Probably r.external is presetting instead a grey-scale color table? In any case quickly solvable with r.colors to apply one of the nice predefined color tables. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
