[Mapserver-users] output to 1band 16 bit geotiff?

[Vincent Schut]

Frank & others,

sorry for my apparently confusing story.
I don't need indexed 16bit images.
I simply want to specify the value the pixel gets in mapserver&gdal 16bit 
geotiff output. In mapserver, afaik the only way to specify the output value 
of a pixel is 'color r g b'. However, you can specify 16bit output using gdal 
in the outputformat tag. But if I specify 16bit output, I always get a 
0-filled geotiff... I'd like to be able to specify the 'color' (but with 
values > 255) of my 16bit output file. I mean, why have 16-bit ouput if you 
cannot specify output values > 255?
So I wondered if, and if yes, how, this was solved using mapserver.
Now, if I specify geotiff output (no 16bit, simple byte output) the classes 
simply get a decreasing number from #classes -> 0 (first class in mapfile= 
highest number, last class=0). This is not of much use...
If it is not possible, that's ok, than I will write rgb's and convert them...

Thanks,
Vincent.

On Monday 23 June 2003 15:01, Frank Warmerdam wrote:
> Vincent Schut wrote:
> > Hi folks,
> >
> > I'm using mapserver to rasterize some vector layers, which it is doing
> > great
> >
> > :)
> >
> > But, I would like to output more than 256 values, and prefereably
> > directly to geotiff format (1 band, 16bit unsigned int). I succeed to
> > output geotiff as 3 band rgb color, or as 1 band (byte) but then the
> > output values are not what I assign in the 'color x x x ' statement in
> > the classes, but the highest color gets the highest value, or something
> > similar. I'm rasterizing provinces which all have a code, but the codes
> > are not continuous; there are some gaps. Could this be done, and how?
> > E.g. I would like to have several classes, where I define the color in
> > the class as 'color [code] 0 0' or something like that, and that as
> > output I get a 1band geotiff, *not* pseudocolored/paletted but as a
> > byte/int band with the code values...
> >
> > I tried several geotiff outputformat combinations (imagemode INT16,
> > formatoption BANDTYPE=Int16, etc) but with no avail...
>
> Vincent,
>
> There is no support in MapServer, GDAL or gd for indexed 16bit bit images
> ... that is producing images with colormaps containing more than 256
> colors.
>
> Sorry,

-- 
______________________________________
Vincent Schut
Sarvision B.V.
Wageningen, The Netherlands
www.sarvision.com