Extract channels from RGB data

Extract one or more channels from an RGB data array that was obtained from an RGB NIfTI image or created by the rgbArray function. The result is more amenable to numeric manipulation.

channels(array, channels = c("red", "green", "blue", "alpha"), raw = FALSE)

Arguments

array	An image, an rgbArray, or another array that can be converted to the latter.
channels	A character vector of channels to extract.
raw	Boolean value: if TRUE, return a raw array, which is the most compact representation; otherwise return an integer array.

Value

A raw-mode or integer-mode array with one more dimension than the first argument, corresponding to channels.

Author

Jon Clayden <code@clayden.org>