Hi Kit,

> ... I would like to ensure that field is coloured (by default) using a 
> specific colour palette. More specifically I want to it to use 2 discrete 
> colours, rather than the rainbow scale. Is this possible?

You can set the number of colors in the lookup table by
+ clicking on the color scale editor button in the toolbar,
+ ensuring that the "Use Discrete Colors" checkbox is ON, and
+ changing the "Resolution" slider to 2.

As long as the field values are uniformly spaced, you can handle more than 2 
colors by changing the resolution appropriately (but note that you may wish to 
use the "Rescale Range" button to keep color band edges from falling on special 
values).

        David 
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