i am currently having grass6.1beta version installed with gdal1.3.1.
While doing import for a jpeg or png file to GTiff format, colours do not get imported. It do make differen files for blue, red green but …
any thing i am miising?
regards
quickNitin
On 31 Jul 2006 11:54:51 -0000, Nitin wrote
i am currently having grass6.1beta version installed with gdal1.3.1.
While doing import for a jpeg or png file to GTiff format, colours do not get imported. It do make differen files for blue, red green but …any thing i am miising?
regards
quickNitin must be 24bit-tiff. combine the rgb-channels with r.composite greetings, Manfred
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Nitin wrote:
i am currently having grass6.1beta version installed with gdal1.3.1.
While doing import for a jpeg or png file to GTiff format, colours
do not get imported. It do make differen files for blue, red green
but ..any thing i am miising?
Either generate a composite map from the separate bands using
r.composite, or (preferably) process and display the bands separately.
To display the map, use d.rgb instead of d.rast. For printing, use
ps.map's "rgb" command instead of the "raster" command. For export,
use r.out.ppm3.
Generating a composite map will normally result in loss of colour
resolution. By default, r.composite uses 32 intensity levels per band,
resulting in 32,768 colours (15-bpp). Using 256 levels per band
results in huge colour tables, which tends to result in significantly
increased CPU and memory usage when processing the map.
Also, the display functions used by d.rast will resample images to a
maximum of 32,768 colours, while d.rgb doesn't have this limitation.
--
Glynn Clements <glynn@gclements.plus.com>
