vdump ${imagedir}/${casename}_3.png
# change colors of first and last intervals
-vcolorscale cs -color 0 0.42 0.35 0.8
-vcolorscale cs -color 4 pink
+vcolorscale cs -color 1 0.42 0.35 0.8
+vcolorscale cs -color 5 pink
# change last label
-vcolorscale cs -label 5 "last"
+vcolorscale cs -label 6 "last"
# set a title for color scale
vcolorscale cs -title "My color scale"