Graphsheet & Image.palette

["Fowler, Mark" <FowlerM@mar.dfo-mpo.gc.ca>]

Hello,
        Seemed straightforward, but couldn't find the answer in the archives (S or R). I want to use a custom color scheme for plotting images (programmatically, not interactively), for example

graphsheet(num.image.colors = 3, num.image.shades = "50,50",
    image.color.table = "0,0,255|0,255,0|255,0,0")
image(xyzobj,zlim=c(0,30), na.rm=T)

        However the resulting graph just uses whatever color scheme exists in image.palette, and image.palette is unaffected by the graphsheet command. Anybody know how to accomplish this? Or maybe a way to derive an image.palette from graphsheet or graphsheet-style specifications (I dread using the names).

Mark Fowler
Population Ecology Division
Bedford Inst of Oceanography
Dept Fisheries & Oceans
Dartmouth NS Canada
B2Y 4A2
Tel. (902) 426-3529
Fax (902) 426-9710
Email fowlerm@mar.dfo-mpo.gc.ca
Home Tel. (902) 461-0708
Home Email mark.fowler@ns.sympatico.ca