[gdal-dev] VRT - using 8BPP palettized tiles

[Chaitanya kumar CH]

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 <oyvind.idland at gmail.com>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
>
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>



-- 
Best regards,
Chaitanya kumar CH.

+91-9494447584
17.2416N 80.1426E
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