Mapserver and the fly conversion of 24bit RGB raster images to 8bit colormapped format

[sylvain.perrinel]

Oki thanks,

Gdalinfo stops on the third band :

"...
Band 1 block=10000x1 Type=Byte, ColorInterp=Red
	Overviews: arbitrary
Band 2 block=10000x1 Type=Byte, ColorInterp=Blue
	Overviews: arbitrary
Band 3 block=10000x1 Type=Byte, ColorInterp=Green
	Overviews: arbitrary

and does not say anything. It does not return to the prompt as if it was 
searching something...

I will upgrade to the SDK 3.2beta version.

Frank Warmerdam a écrit :
> On 6/13/05, sylvain.perrinel <sylvain.perrinel at agriculture.gouv.fr> wrote:
> 
>>Hello,
>>I'm trying to make a map with an ecw layer. But, Mapserver does not want
>>to convert my 24bit RGB ecw image to 8bit like documentation says :
>>http://mapserver.gis.umn.edu/doc35/raster-howto.html#rgb_color_cube .
>>
>>Gdal support ecw format and the commande "gdalinfo" on the ecw layer
>>stops on the color table and doesn't say anything. I think it tries to
>>recover the table color !
> 
> 
> Sylvain,
> 
> When you say "stops on the color table", do you mean that it 
> starts to report a color table?  Then hangs?  I am surprised if there
> is ever a report of a color table on ECW bands by gdalinfo.  However,
> the hang behavior is fairly common with some versions of the ECW library
> on Linux and I think relates to some sort of race condition in the
> multi-threaded
> stuff in the ECW library.  Upgrading to the latest ECW library may help in this
> regard.
> 
> Best regards,

-- 
Sylvain Perrinel
Ministère de l'Agriculture et de la Pêche
Toulouse
France