[gdal-dev] Combining quantized png files in gdal2tiles

[Even Rouault]

Le jeudi 13 juin 2013 06:29:32, Phil Scadden a écrit :
> 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).

Not sure to completely follow you ...

> 
> Does GDAL read quantized PNG properly but some intermediary processing
> needed (what??) or is there a problem with the driver?

I've just done some quick testing by running pngnq on a sample PNG, and the 
GDAL PNG driver seems to handle the generated XXXXX-nq8.png file well.

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