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For the PseudoColor visual, the color ramp is a set of color cells
reserved for display of images. By default, the color ramp is filled
with a greyscale, so that displayed images are greyscale images. The
user can change the display colors using the tvlct command, which
modifies the whole color ramp based on the red, green, and blue values
specified in the tvlct command, using linear interpolation.
See also: Colors, Image Display, tvlct