Raster images

[N R A]

I've imported a black and white GIF image into GRASS - the image is a 
raster Ordnance Survey 1:10,000 map - problem is it's 60 Mbytes in size 
and we have about 700 of them.
I assume that the large size is because GRASS is storing each pixel as a 
byte, whereas the GIF image is using a single bit to represent each pixel.

My question is 'Is there any way to store the image in GRASS at bit 
level' and so reduce the file storage to a more reasonable level.

Cheers,

Steve Culshaw
NRA North West
e-mail : nra at cix.compulink.co.uk (use this for general usage)
or         sculshaw at cix.compulink.co.uk (Private - only checked at best 
biweekly)