I was hacking gdal2tiles a bit by running pnqnq of a base tile
immediately after creating it (I want to be able to run partial updates
on a TMS which has been pngnq optimised). No problem with that, but
updating the overview tiles produces issues. It does
writeraster(......,readraster(....)) on those png files and in the
output, then colour palette is more of grayscale (actually a readscale).
Does GDAL read quantized PNG properly but some intermediary processing
needed (what??) or is there a problem with the driver?
--
Phil Scadden, GNS Science Ltd 764 Cumberland St, Private Bag 1930,
Dunedin, New Zealand Ph +64 3 4799663, fax +64 3 477 5232
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