change 4-bytes-per-cell to 1-byte-per-cell?

[Bill Hargrove]

If I have a 4-bytes-per-cell GRASS raster map that now only contains values
less than 255, is there some GRASS tool that will change it to be only
1-byte-per-cell to save disk space?

r.resample does not appear to do it, and I don't believe that r.compress or
r.mapcalc will figure this out either.

I'd appreciate it if someone had advice about this ...

                                         Bill H.
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