# NOT RUN {
spec.test <- function(mat, spec.col) image(z = t(mat), col = spec.col)
mat <- matrix(1:30, ncol = 6, byrow = TRUE)
spec.test(mat = mat, spec.col = gray.1())
spec.test(mat = mat, spec.col = gray.2())
spec.test(mat = mat, spec.col = gray.3())
spec.test(mat = mat, spec.col = rainbow.1())
spec.test(mat = mat, spec.col = topo.1())
# }
# NOT RUN {
# Colors are defined as:
gray.1 <- function(n = 30) gray(seq(1, 0, length.out = n))
gray.2 <- function(n = 30) gray(1-seq(0, 1, length.out = n)^2)
gray.3 <- function(n = 30) gray(1-seq(0, 1, length.out = n)^3)
rainbow.1 <- function(n = 15) rev(rainbow(n))
topo.1 <- function(n = 12) rev(topo.colors(n))
# }
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