[GRASS-dev] Re: i.rgb.his/i.his.rgb and 16bit images

[Georg Kaspar]

Hamish wrote:
> Georg wrote:
>> Actually the purpose was pansharpening.
> 
> i.fusion.brovey -q

yes, i know this module, but i wanted to compare different approaches ;)

>> This could also be done with principal components, but grass
>> lacks an inverse-pca module as far as i know...
> 
> maybe Nikos could comment.
> 
> Note that with the R-grass bridge you can use any of the many R
> statistical methods + functions.

R is great as long as your datasets are small. problems arise when you 
try to process l a r g e image files in R...

> ps- patch added in the trac system to allow i.rbg2his to work
> with 11-bit data (I fixed the truncation to 255 you saw before),
> but d.his and i.his2rgb are still 8-bit only for now. Waiting
> on word that I'm on the right track before moving onto the other
> modules.

thanks for that. i'm shure this is a nice improvement and one reason 
less to use erdas...;)