integer pixel matrix, each pixel value is in range 0-255 and refers to an index in a palette. The palette is NOT included in the file, so you will need to define one or get it from elsewhere to see the final image.
Arguments
filepath
character string, path to the file including extension
hdr
logical, whether to return full list with header
hdr_only
logical, whether to read only the header
apply_palette
optional 256 x 3 integer matrix, the palette. Must contain values in range 0..255. Pass NULL if you do not want to apply any palette. The resulting wal object will not have an 'image' entry then.