Oyvind, VRT does support colortable expansion. Check out the ComplexSource sub-topic in the vrt doc page[1]. > > From the The ComplexSource supports fetching a color component from a > source raster band that has a color table. The ColorTableComponent value is > the index of the color component to extract : 1 for the red band, 2 for the > green band, 3 for the blue band or 4 for the alpha band. >
[1]: http://www.gdal.org/gdal_vrttut.html On Wed, Apr 11, 2012 at 1:27 PM, Oyvind Idland <[email protected]>wrote: > Hello, > > I am fiddling with some old scanned (handmade) maps. In order to reduce > the size of the data, and since > the maps has a limited amount of colors, i figured that using palettized > 8BPP tiffs would be suitable in this > case. > > I got several tiles that make up the whole area, using rgb(0,0,0) as > nodata (making JPEG compression > unsuitable) > > The idea was to use VRT to join these together, but since they all have > different color tables, > this is not possible. > > Would it be an idea to implement support for an "expand option" in VRT, > e.g expanding to rgb/rgba ? > > Not sure how many would need this feature though. > > > -- oyvind > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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