[R] colorRamp of image to span larger range than dataset

[Daisy Englert Duursma]

Hello and thanks in advance,

Using the dataset volcano:
ascols = colorRampPalette(c("gray","yellow","darkgoldenrod1","orange","red"),interpolate="spline")
x <- 10*(1:nrow(volcano))
y <- 10*(1:ncol(volcano))
image(x, y, volcano, col = ascols, axes = FALSE)

In the example above, how would I change my colorRampPalette or image
function so that it would span to 300 even though max(volcano)  = 195?
The image I want to make should not return any red because it does not
reach the true maximum possible value which is 300.


Thanks,
Daisy



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