Hi Peter,
peter.loewe wrote:
the straightforward approach to write out a raster to
either a JPG or a PNG via r.out.gdal WITHOUT additional
createopt-parameters results in errors (r.out.png works fine
,though).Where are the missing parameters documented? Are there
examples anywhere ?(couldn't find any)
do you mean these errors:
G65> r.out.gdal in=elevation.dem out=elevdem.jpg format=JPEG
Driver <JPEG> does not support direct writing. Using MEM driver for
intermediate dataset.
Exporting to GDAL data type: UInt16
100%
Input raster map contains cells with NULL-value (no-data). The value 0 was
used to represent no-data values in the input map. You can specify a nodata
value with the nodata option.
Warning 6: JPEG driver ignores color table. The source raster band will be considered as grey level.
r.out.gdal complete.
(only NULL/non-NULL image created)
G65> r.out.gdal in=elevation.dem out=elevdem.png format=PNG
Driver <PNG> does not support direct writing. Using MEM driver for
intermediate dataset.
Exporting to GDAL data type: UInt16
100%
Input raster map contains cells with NULL-value (no-data). The value 0 was
used to represent no-data values in the input map. You can specify a nodata
value with the nodata option.
ERROR 1: libpng: Invalid color type/bit depth combination in IHDR
ERROR: Unable to create raster map <elevdem.png> using driver <PNG>
see also d.out.file in grass 6.4 and 6.5.
Hamish