Hi Sven,
It's not the role of gdalwarp to tell the color to be rendered with no
data values.
In your example, gdalwarp tells the renderer to display the pixels with
values equal to 255 with a color specified by the renderer.
It only adds in the tif files a tag that set the white color as transparent.
For example, with Mapserver as a renderer, you will set in the mapfile
the background color as white (IMAGECOLOR 255 255 255).
What software are you using to view your files ?
What is the color in the source file that you want as transparent / white ?
Regards,
Benoît
Le 28/05/2010 11:05, Sven Schroeter a écrit :
Hi,
I use the gdalwarp utility to transform geotifs:
gdalwarp -co compress=lzw -s_srs "+proj=tmerc +lat_0=0 +lon_0=6
+k=1.000000
+x_0=2500000+y_0=0 +ellps=bessel +units=m
+towgs84=590.1181,99.6226,340.1890,1.185095,-1.334952,-2.904521,16.51559"
-t_srs
"+proj=utm +ellps=GRS80 +datum=WGS84 +zone=32" -dstnodata 255
bbp07231053_2559-wla_0053-1a.tif out/bbp07231053_2559-wla_0053-1a.tif
I want to convert the new "nodata-areas" to be displayed in white (255
255
255)
if I try -dstnodata 255 or -dstnodata "255 255 255" in every picture
the no
data areas have other colors but not white. What can I do?
Thanks
Sven
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