problems with r.in.ppm, r.in.tiff

[an lu]

Hi GrassUser,

i am a beginner of Grass.i try to import a ppm or tiff
picture into Grass using r.in.tiff or r.in.ppm.

i drawed the picture using XFig, and  exported it as
*.ppm. then i used  r.in.ppm,   i got an error
information: unknown ppm magic number.

i try to import the ppm picture which is exported from
grass  back to Grass again, and it works. 

from the rmanual, i read that r.in.ppm can convert ppm
raster file into raster file. i guess maybe i need to
convert a pure ppm file into ppm raster first, could
you tell me how to do that? if that is not the reason,
what i need to do?
Thanks.

--lu


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