Hi Scott, As I mentioned to Laurentiu, I'm still not getting the handle on how to use overviews but will keep working at it. However, this is only useful to me (and probably to other people) if they can be used from a python script, not from the OS. Thanks, Arturo Scott wrote: As a test you can skip the whole python debacle and try this: gdal_translate -f COG -co COMPRESSÞFLATE -scale 0 255 -ot Byte source.tif target.tif On 6/1/23 07:35, afernandez wrote: Hello, I'm generating a raster file with GDAL. The pseudo-code (where the > raster is loaded as 'var') for the colored version reads: # Initial manipulations dims = var.dimensions shape = var.shape driver_name = 'GTIFF' driver = gdal.GetDriverByName(driver_name) np_dtype = var.dtype type_code = gdal_array.NumericTypeCodeToGDALTypeCode(np_dtype) gdal_ds = driver.Create(_my_path_, cols, rows, 1, > gdal.GDT_UInt16) gdal_ds.SetProjection(_my_projection_) gdal_ds.SetGeoTransform(_my_transformation_) # Creation of the bands and scaled matrix band = gdal_ds.GetRasterBand(1) data = var[_chosen_index_] data = ma.getdata(data) data_scaled = np.interp(data, (data.min(), data.max()), (0, > 255)) data_scaled2 = data_scaled.astype(int) # This is to rescale > into integers so that it can color the layer # *** Lines to set up the color palette *** # Write the array to band once everything has been rescaled band.WriteArray(data_scaled2) gdal_ds.FlushCache() This works well but the problem is that the generated file becomes too > large and difficult to work with. If I change to a black and white > representation by simply changing the 7th line to: gdal_ds = driver.Create(out_path, cols, rows, 1, type_code) The new file has a size smaller than 1% of the colored one. I was > wondering if there is anything intermediate (with colors but generating > a smaller size) or if I would need a more radical approach such as using > a driver different from GTIFF or something else. Thanks. > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
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