Write a color map to file — write

Write an ieegio_colormap or ieegio_colortable to disk. The default format is threeBrain/RAVE JSON, which preserves all information and is readable by both ieegio and threeBrain.

Usage

write_colormap(
  x,
  con,
  format = "threebrain",
  gtype = c("auto", "surface", "volume"),
  ...
)

Arguments

x: an ieegio_colormap or ieegio_colortable
con: file path to write
format: output format; currently only "threebrain" (default) and "fs_lut" are supported
gtype: geometry type for the threeBrain format: "auto" (default; discrete maps use "volume", continuous maps use "surface"), "surface", or "volume"; ignored for other formats
...: additional arguments

Examples

# Build a discrete colormap with region labels
ct <- 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)
))
lut <- as_ieegio_lookup(data.frame(
  Key   = 1:3,
  Label = c("Cortex", "White matter", "CSF")
))
cm <- as_ieegio_colormap(ct, lookup = lut)

# Write as threeBrain JSON (default)
tmp_json <- tempfile(fileext = ".json")
write_colormap(cm, tmp_json)

# Write as FreeSurfer LUT
tmp_lut <- tempfile(fileext = ".txt")
write_colormap(cm, tmp_lut, format = "fs_lut")

unlink(c(tmp_json, tmp_lut))