Frank Warmerdam schrieb: > Tom Kazimiers wrote: >>> There is also a RasterIO() method on the Dataset which allows >>> fetching all the bands in one request. In C++ this is: >>> >>> http://www.gdal.org/classGDALDataset.html#e077c53268d2272eebed10b891a05743 >>> > >> thank you very much - this was what I was looking for. Unfortunately I >> need to write Data in the form Band3, Band2, Band1, Band3, Band2, Band1, >> ... (BGR) >> Like you have said, the reading is sequential and it was not very hard >> to get it working with a result of the form Band1, Band2, Ban3, Band1, >> Band2, Band3, ... (RGB) >> Is there a way to change the order of the bands so that I can use this >> function (alternatively I could write a fast switch function, sure - but >> it would be nicer to have it all in one function)? With three seperate >> calls to the per-raster-band-RasterIO I can controle everything pretty >> good, but it seems that the per-dataset-RasterIO is faster (maybe >> illusion :P). > > Tom, > > To read or write from a BGR buffer you can either passing the band > list reversed (ie. panBandMap is {3,2,1}) or fudze with the > pixelspace, linespace and bandspace values to simulate the reverse. > > Sometimes dataset level io will be faster but often it is internally > implemented by calling band level io. > > Best regards,
Thank you very much, Frank. This works perfectly :) Best regards, Tom _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
