[gdal-dev] Problems to define trancparency

[Jan Tappenbeck]

  HI !

after my problems to transform rasterimage now i have a problem to make 
the white background tranparency.

After the translation the new image had following status:

C:\Program Files (x86)\FWTools2.4.7>gdalinfo 
"D:\City\raster\gas\500\twf_chec
k\baseline_etrs.tif"
Driver: GTiff/GeoTIFF
Files: D:\City\raster\gas\500\twf_check\baseline_etrs.tif
Size is 16568, 9564
Coordinate System is:
PROJCS["ETRS89 / UTM zone 32N",
     GEOGCS["ETRS89",
         DATUM["European_Terrestrial_Reference_System_1989",
             SPHEROID["GRS 1980",6378137,298.2572221010002,
                 AUTHORITY["EPSG","7019"]],
             AUTHORITY["EPSG","6258"]],
         PRIMEM["Greenwich",0],
         UNIT["degree",0.0174532925199433],
         AUTHORITY["EPSG","4258"]],
     PROJECTION["Transverse_Mercator"],
     PARAMETER["latitude_of_origin",0],
     PARAMETER["central_meridian",9],
     PARAMETER["scale_factor",0.9996],
     PARAMETER["false_easting",500000],
     PARAMETER["false_northing",0],
     UNIT["metre",1,
         AUTHORITY["EPSG","9001"]],
     AUTHORITY["EPSG","25832"]]
Origin = (380297.397497169380000,5745229.623735004100000)
Pixel Size = (0.032091644585721,-0.032091644585721)
Metadata:
   AREA_OR_POINT=Area
Image Structure Metadata:
   INTERLEAVE=BAND
Corner Coordinates:
Upper Left  (  380297.397, 5745229.624) (  7d15'44.21"E, 51d50'42.10"N)
Lower Left  (  380297.397, 5744922.699) (  7d15'44.59"E, 51d50'32.17"N)
Upper Right (  380829.092, 5745229.624) (  7d16'11.98"E, 51d50'42.51"N)
Lower Right (  380829.092, 5744922.699) (  7d16'12.36"E, 51d50'32.58"N)
Center      (  380563.245, 5745076.161) (  7d15'58.29"E, 51d50'37.34"N)
Band 1 Block=16568x1 Type=Byte, ColorInterp=Palette
   Color Table (RGB with 256 entries)
     0: 255,255,255,255
     1: 0,0,0,255
     2: 0,0,0,255
     3: 0,0,0,255
     4: 0,0,0,255
     5: 0,0,0,255
     6: 0,0,0,255
     7: 0,0,0,255
     8: 0,0,0,255
     9: 0,0,0,255
    10: 0,0,0,255
    11: 0,0,0,255
    12: 0,0,0,255
    13: 0,0,0,255
    14: 0,0,0,255
....

i try to make the image transparency by

C:\Program Files (x86)\FWTools2.4.7>gdalwarp -srcnodata 0 -dstalpha 
"D:\City\
raster\gas\500\twf_check\baseline_etrs.tif" 
"D:\City\raster\gas\500\twf_check
\baseline_etrs_t.tif"
Copying color table from 
D:\City\raster\gas\500\twf_check\baseline_etrs.tif t
o new file.
Creating output file that is 16568P x 9564L.
ERROR 6: SetColorTable() not supported for multi-sample TIFF files.
Processing input file D:\City\raster\gas\500\twf_check\baseline_etrs.tif.

but there comes the message "ERROR 6: SetColorTable() not supported for 
multi-sample TIFF files." and the result image is only 1 Color !!!!!!!!

the status now is
C:\Program Files (x86)\FWTools2.4.7>gdalinfo 
"D:\City\raster\gas\500\twf_chec
k\baseline_etrs_t.tif"
Driver: GTiff/GeoTIFF
Files: D:\City\raster\gas\500\twf_check\baseline_etrs_t.tif
Size is 16568, 9564
Coordinate System is:
PROJCS["ETRS89 / UTM zone 32N",
     GEOGCS["ETRS89",
         DATUM["European_Terrestrial_Reference_System_1989",
             SPHEROID["GRS 1980",6378137,298.2572221010002,
                 AUTHORITY["EPSG","7019"]],
             AUTHORITY["EPSG","6258"]],
         PRIMEM["Greenwich",0],
         UNIT["degree",0.0174532925199433],
         AUTHORITY["EPSG","4258"]],
     PROJECTION["Transverse_Mercator"],
     PARAMETER["latitude_of_origin",0],
     PARAMETER["central_meridian",9],
     PARAMETER["scale_factor",0.9996],
     PARAMETER["false_easting",500000],
     PARAMETER["false_northing",0],
     UNIT["metre",1,
         AUTHORITY["EPSG","9001"]],
     AUTHORITY["EPSG","25832"]]
Origin = (380297.397497169380000,5745229.623735004100000)
Pixel Size = (0.032091644585733,-0.032091644585733)
Metadata:
   AREA_OR_POINT=Area
Image Structure Metadata:
   INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left  (  380297.397, 5745229.624) (  7d15'44.21"E, 51d50'42.10"N)
Lower Left  (  380297.397, 5744922.699) (  7d15'44.59"E, 51d50'32.17"N)
Upper Right (  380829.092, 5745229.624) (  7d16'11.98"E, 51d50'42.51"N)
Lower Right (  380829.092, 5744922.699) (  7d16'12.36"E, 51d50'32.58"N)
Center      (  380563.245, 5745076.161) (  7d15'58.29"E, 51d50'37.34"N)
Band 1 Block=16568x1 Type=Byte, ColorInterp=Gray
   Mask Flags: PER_DATASET ALPHA
Band 2 Block=16568x1 Type=Byte, ColorInterp=Alpha

Can anyone help me ??

reagards Jan :-)