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Dump an image raster to the terminal in Sixel format
raster2sixel(raster)
Called for it's side effect of writing the image to the terminal (standard out). Returns NULL invisibly.
NULL
the image 'raster' e.g. the output of as.raster.
as.raster
Sixel is a bitmap format supported by some terminals. See, for example, https://en.wikipedia.org/wiki/Sixel.
See raster2tgp for output using Terminal Graphics Protocol.
raster2tgp