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