raster image preprocessing problem.

[Zhonghai Wang]

and the eror info in the FW Shell is:

Traceback (most recent call last):
File "C:\programme\FWTOOL~1.0B2\bin\pct2rgb.py", line 46, in import Numeric
ImportError: No module named Numeric

thanks

On 6/6/06, Zhonghai Wang <zhonghaiw at gmail.com> wrote:
>
>  Hi Travis,
>
> I think you are right, better I do the merging in RGB model, but it's
> strange that I can not use the pct2rgb.py commnd, and the rgb2pct.py command
> is no problem. Do you have any ideas why this happened?
>
> zhonghai
>
>
>  On 6/6/06, Travis Kirstine GIS Tech <tkirstine at jdbarnes.com> wrote:
> >
> >  Zhonghai,
> > My guess is that both the gdal_warp and gdal_merge utilities use the
> > pusedo colour table of the first image and apply that table to all other
> > images, I would try converting the gif to RGB geotiffs using the pct2rgb
> > gdal utility then go through your processing steps(warping and merging) then
> > convert the images back to 8bit GIFs.  I hope this helps
> >
> > Travis
> >
> > -----Original Message-----
> > *From:* UMN MapServer Users List [mailto: MAPSERVER-USERS at LISTS.UMN.EDU]
> > *On Behalf Of *Zhonghai Wang
> > *Sent:* Tuesday, June 06, 2006 6:35 AM
> > *To:* MAPSERVER-USERS at LISTS.UMN.EDU
> > *Subject:* [UMN_MAPSERVER-USERS] raster image preprocessing problem.
> >
> > Hi there,
> >
> > I have a couple of GIFs with wld files, but the original Projection is
> > not the one I want, I tried to use the Proj4 to reproject them on-the-fly,
> > but it takes really long to perform the map request, therefore I tried
> > to preprocess the images with GDAL tools, but I've got some problems here:
> >
> > 1. problem with gdalwarp: trying to mosaic the images into one output
> > file, but only the first image has the correct image color, the other images
> > are rendered with strange colors, is this a common problem if using gdalwarp
> > to mosaic images?
> >
> > 2.problem with gdal_merge.py: after trying the gdalwarp command, I've
> > tried the gdal_merge.py command to merge all the images together with the
> > -pct parameter, unfortunately, the merged image is the same as the first
> > try. is it possible to merge images using the command with the correct color
> > table?
> >
> > BTW: I can not use the gdal_translate command, since there are gaps
> > between the reprojected images.
> >
> > thanks for your info.
> >
> > zhonghai
> >
> >
>
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