Grabbing or dumping screen shots limits you both in spatial and color
resolution.  Using a very large CELL as your monitor can resolve the
spatial problem, but you're still limited to the color allotment that
your graphics commands produce.  When I need more color depth (e.g.,
true 24-bit depth for composite satellite data), I create a binary
uncompressed raster -- up to three separate ones for multi-channel
data -- and use PhotoShop to translate them into a format that the
mail-order service bureaus can read (e.g., TIFF).  Many of these
places will take your file and for $3-10 (depedning on how fast you
want it) give you back a slide with resolution of 4K or 8K lines,
and your full color depth.  The results are pretty breathtaking.
I've done this for 4K resolution slides, and input files of 1500 - 2000
lines resolution seem to be well suited to this kind of production.

For graphics requiring fewer colors, I just write to the CELL
driver of an appropriate size, as others have discussed.

Neel Smith
nsmith@polar.bowdoin.edu

