[Gnuplot-info] smooth and variable colour

[Tamas H. <ho...@gm...>]

I have a data file (foo.csv) consisting x,y coordinates, and colours defined
in hexadecimal

% plot 'foo.csv' using 1:2:3 with lines lc rgb variable linewidth 8 title
'foochart'

The above plots the data with perfect colouring.
However if I add smoothing (for example csplines, but happens with other
smoothing algorithms too)

% plot 'foo.csv' using 1:2:3 with lines lc rgb variable linewidth 8 title
'foochart' smooth csplines

I get short gradients of blue fading to black (if the associated y values
are above 0), and yellow fading to white (if the associated y values are
below 0).

Is there any way to correct this problem? (short of not using smoothing)
The problem occurs in both 4.4 rc1 and 4.5 csv.