[gdal-dev] gdal2tiles.py zoom levels -- how to display "raw" pixels?

[Jonathan Greenberg]

GDALers:

I'm trying to get gdal2tiles to give me a zoom level that displays the
raw, full resolution, un-resampled pixels at a certain zoom level.
What zoom (-z) setting should I use?  I am very confused what,
precisely, the zoom levels refer to in terms of pixels/unit area.  My
input data is a 50cm Worldview-2 image.  Thanks!

--j