Read a color map file — read

Read a color map or color lookup table from a file. The format is auto-detected from the file extension and content.

Usage

read_colormap(file, type = "auto", ...)

Arguments

file: path to the color map file
type: one of "auto" (default), "fs_lut", "fs_annot", "afni", "fsl", "threebrain"
...: additional arguments passed to the format-specific reader

Value

An ieegio_colormap or ieegio_colortable object.

Examples

# Write a colormap to a temp file and read it back
cm <- as_ieegio_colormap(as_ieegio_colortable(data.frame(
  Key = 1:3,
  R = c(255L, 0L, 0L), G = c(0L, 200L, 0L),
  B = c(0L, 0L, 180L), A = c(255L, 255L, 255L)
)))
tmp <- tempfile(fileext = ".json")
write_colormap(cm, tmp)
cm2 <- read_colormap(tmp)
print(cm2)
#> <ieegio Colormap [discrete]>
#>   Colorspace   : RGB
#>   Color stops  : 4  (keys 0 to 3)
#>   Lookup       : 4 labels
unlink(tmp)