[Geotools-gt2-users] Why does writing out a world image takes minutes?

[gaby <g....@ni...>]

I am reading in a world image PNG, reprojecting it, and writing it out. The
process, when I use
GridFormatFinder, takes about a minute or so. If I use WorldImageReader, it
takes twice as long. 
In either case, it is unacceptably long. Perhaps I am not setting some
parameters correctly?
The file is 383KB
My code below.

try {
	File rasterFile = new File("TestData/heathcote_max_vel.png");
	/*
        WorldImageFormat format = (WorldImageFormat)
GridFormatFinder.findFormat( rasterFile );
	AbstractGridCoverage2DReader reader = format.getReader(rasterFile);
	*/
	WorldImageReader reader = new WorldImageReader(rasterFile, null);
	GridCoverage2D myGridCov = reader.read(null);
	GridCoverage2D reprojected = (GridCoverage2D)
Operations.DEFAULT.resample(myGridCov, CRS.decode("EPSG:2193"));
	WorldImageWriter wiw = new WorldImageWriter(new
File("TestData/NZTM/heathcote_max_vel.png"));
        ParameterValueGroup params =
reader.getFormat().getWriteParameters();

params.parameter(WorldImageFormat.FORMAT.getName().toString()).setValue("png");
	GeneralParameterValue[] gpv =
{params.parameter(WorldImageFormat.FORMAT.getName().toString()) };
	wiw.write(reprojected, gpv);
	wiw.dispose();
} catch (IOException e) {
	e.printStackTrace();
} catch (CoverageProcessingException e) {
	e.printStackTrace();
} catch (NoSuchAuthorityCodeException e) {			
	e.printStackTrace();
} catch (FactoryException e) {
	e.printStackTrace();
}

Thanx
Gaby



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