[gdal-dev] Creating a transparent GeoTIFF, writing shape data over it, reading GeoTIFF writing as PNG with transparency.

[Gane R]

1. Can I create a transparent GeoTIFF like PNG with alpha channel ?

2. Can I used gdal_rasterize to draw shape over the GeoTIFF with
tranparency

3. Can I read a part of the GeoTIFF using GDALRasterIO and write as PNG
with the same transparency preserved.

Say some kind of work flow with gdal command line tools will be of great
help.

Gane
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