[GRASS-dev] Re: i.rgb.his/i.his.rgb and 16bit images
georg at muenster.de
Fri Oct 2 07:21:55 EDT 2009
> Very sorry if this is a dumb question, but did you set n_levels= to
> 65535? (it defaults to 8bit)
actually i set it to 2048 but i guess i should have used 2047. the data
seems to be encoded using 11bits
> Does 'i.rgb2his --help' show the option? what does 'r.info -r' say about
> the 3 r,g,b bands?
yes, the option is shown.
r.info -r on initial datasets
> really that option name is misleading, it should be max_level=255 or
> n_levels=256 or bitdepth=8. I think to go with bitdepth= with 8,16 as
> the only options. Anyone know if 32bit or other bits satellite/imagery
> data exist?
yes, quickbird seems to use 11bit ;)
but i guess grass will use 16bit to store the data anyway...
> set colors with:
> r.colors band.red color=rules
> 0 black
> 65535 white
> note that i.his2rgb has not been modified; experimenting with i.rgb2his
> do you know of any free-for-download QB data for testing it with?
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