Seems that I'm not the only one to have problems with color ramps...
Nearly everything was explained in the on-line help. Nearly...
"Complete the following steps to change the colors of a color ramp.
1. Right-click the color ramp or a marker and select Marker Spacing»Arbitrary from the shortcut menu to switch the color ramp to arbitrary marker spacing.
2. Use the Operating or Positioning tools to right-click the marker next to the color ramp and select Marker Color from the shortcut menu to change the color associated with a marker.
3. Select the color you want from the color picker that appears."
Additionnal hints :
After switching to arbitrary marker spacing, suppress all intermediate markers (right click> Delete). Then adjust the colors of th
e two remaining end markers. With some ramps, you will be obliged to move slighty the marker position to get a color update.
If you need to insert intermediate colors, add intermediate markers (right click > Add). Using the text tool, type in the exact value associated with the marker. Select the color you want to associate with the marker.
When finished, switch back to uniform marker spacing.
Have fun...
CC
Chilly Charly (aka CC)