Jan, You can use the -srcnodata and -dstalpha options of gdalwarp[1] to set nodata values and create an alpha band to the image. You will have to give the value of the black borders with the -srcnodata option.
[1]: http://www.gdal.org/gdalwarp.html On Mon, Nov 7, 2011 at 5:33 PM, Jan Tappenbeck <[email protected]>wrote: > > > Hi ! > > i have a image with following data: > > C:\Program Files (x86)\FWTools2.4.7>gdalinfo "[Path]\trans_a.tif" > Driver: GTiff/GeoTIFF > Files: D:\brumi\VG_Bruchmuehlbach-**Miesau_DOP\geotiff\trans_a.tif > Size is 10390, 10390 > Coordinate System is: > PROJCS["DHDN / 3-degree Gauss-Kruger zone 2", > GEOGCS["DHDN", > DATUM["Deutsches_**Hauptdreiecksnetz", > SPHEROID["Bessel 1841",6377397.155,299.**1528128000009, > AUTHORITY["EPSG","7004"]], > AUTHORITY["EPSG","6314"]], > PRIMEM["Greenwich",0], > UNIT["degree",0.**0174532925199433], > AUTHORITY["EPSG","4314"]], > PROJECTION["Transverse_**Mercator"], > PARAMETER["latitude_of_origin"**,0], > PARAMETER["central_meridian",**6], > PARAMETER["scale_factor",1], > PARAMETER["false_easting",**2500000], > PARAMETER["false_northing",0], > UNIT["metre",1, > AUTHORITY["EPSG","9001"]], > AUTHORITY["EPSG","31466"]] > Origin = (2601576.178792405400000,**5477422.986974134100000) > Pixel Size = (0.200049845331526,-0.**200049845331526) > Metadata: > AREA_OR_POINT=Area > Image Structure Metadata: > INTERLEAVE=PIXEL > Corner Coordinates: > Upper Left ( 2601576.179, 5477422.987) ( 7d24'1.33"E, 49d25'34.75"N) > Lower Left ( 2601576.179, 5475344.469) ( 7d23'59.41"E, 49d24'27.48"N) > Upper Right ( 2603654.697, 5477422.987) ( 7d25'44.45"E, 49d25'33.49"N) > Lower Right ( 2603654.697, 5475344.469) ( 7d25'42.50"E, 49d24'26.22"N) > Center ( 2602615.438, 5476383.728) ( 7d24'51.92"E, 49d25'0.49"N) > Band 1 Block=10390x1 Type=Byte, ColorInterp=Red > Band 2 Block=10390x1 Type=Byte, ColorInterp=Green > Band 3 Block=10390x1 Type=Byte, ColorInterp=Blue > > there are black arrows at the border (by transformation) - is it possible > to make i transparency ? > > how? > > gdal_translate -of ECW old_image.tif new_image.ecw > > tells that is unpossible !!! > > can you help me ? > > regards Jan :-) > > > ______________________________**_________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/**mailman/listinfo/gdal-dev<http://lists.osgeo.org/mailman/listinfo/gdal-dev> > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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