[GRASSLIST:1714] Imagery rectification

[Artemis]

Hello all,

I'd like to learn how to rectify
satelite imagery. I have several
images represented in 3 "channels"
(or perhaps "bands"). All they
together cover some territory,
and are in windows bmp format.
(3 .bmp files for each "band")
They also contain approximate
lat/lon corner coordinates 
(but not exact) in descriptions.

The image processing tutorial
by Victoria Harmon and Michael
Shapiro doesn't tell anything
about importing such data.

The questions is what steps
are required to rectify them in GRASS,
using some digital maps, that
cover the same region (I already
have elevation in isolines
and raster and vector streams,
though not of the same resolution)?

I would be thankful for any information,
as I've never did such things
before.

Artemis.