A ColorTable has a set of Ncol colors which can be indexed individually or mapped onto real values. In the latter case, they are spread uniformly between Cmin and Cmax with values beyond this range being colorless or set to the extreme values according to the fillAbove and fillBelow fields.
The color table does its best not to lose information as you
change its size: each time you set a color manually, the present size
of the table becomes the true resolution.
user interface: ColorTableEditor
| field | type | contents / default value | |
| Cmin | double | 0.0 | variable: Cmin type: double |
| Cmax | double | 1.0 | variable: Cmax type: double |
| Ncol | integer | 100 | variable: Ncol type: integer |
| fillAbove | boolean | true | variable: fillAbove type: boolean |
| fillBelow | boolean | true | variable: fillBelow type: boolean |