R2G converts 2-Colour-Raster-Pics to 16-Color-Greyscale-Pics.
It is the first program that allows this transformation.
The archive contains some Demo-Pics too.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]               117981  135278  87.2% -lh5- 4a76 Oct 11  1992 Face.grey
[generic]               117996  135326  87.2% -lh5- 3cba Oct 11  1992 Face.grey.bug
[generic]                90167  124520  72.4% -lh5- ec62 Oct 11  1992 Face.grey.high
[generic]                18518   33230  55.7% -lh5- 6d34 Oct 11  1992 Face.rast
[generic]                 7578   14324  52.9% -lh5- 3236 Oct 11  1992 r2g
[generic]                 1302    2697  48.3% -lh5- 7ea9 Oct 11  1992 R2G.dok
[generic]                 1428    6160  23.2% -lh5- 7355 Oct 11  1992 R2G.mod
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         7 files  354970  451535  78.6%            Oct 12  1992