[Gnuplot-info] How to display colorbox (legend) with gray scale?

[Joe K. <jko...@co...>]

I have been using gnuplot-4.0 and gnuplot-4.1 to display gray-scale data
with pm3d for over a year. My latest build of gnuplot-4.1 (CVS Sept. 19)
refuses to display the colorbar/colorbox for the plot to the right of the
data frame, although earlier gnuplot versions still display it correctly. I
checked the online help, and added set colorbox to the script without
success. This is on my Mac G5 under OS X 10.4.7 with AquaTerm-1.0.1.

The idea is to display data curves where low amplitude data fades into
white, and high amplitude data is black. Here is the script:

set terminal aqua 1 fname "ArialMT" fsize 18
set palette gray negative
set view map
set mytics 10
set logscale y
set yrange [10:100000]
set colorbox vertical default
set title 'Frequency Response vs. Time'
set xlabel 'Time, s'
set ylabel 'Frequency, Hz'
set label 'Amplitude, g' at screen 0.97,0.45 rotate by 90
set nokey
splot 'spectrum.txt' with points palette pt 3 ps 0.3
set terminal postscript
set output "spectrum.eps"
replot

As I mentioned, I just now added the set colorbox line. The file
spectrum.txt contains several lines of data that still display correctly
within the plot frame, with the correct gray-scale values shown.

How do I turn on the colorbar/colorbox for gray scale. My color pm3d tests
seem to be working correctly with the colorbar correctly displayed.

Thanks for any ideas.

Joe