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ColorData as a Funnction of height values

Dear all,

I have a long list of numerical values, {x,y,f(x,y)}, representing 
the value of a field in the points (x,y). I want to visualize them 
using ListContourPlot or ListDensityPlot. I have two poblems:

1. I want to change the colour to a usual scale of Blue-Minimum and 
Red-Maximum, or to make something similar to

ColorFunction -> Function[{x, y, z}, Hue[z]]

but with my numerical data, not with a function. How can I do this?

2. When including a legend with ListContourPlot or LisDensityPlot, 
how can I include the white colour which is already included in the 
plot but not in the legend?

Thanks in advance

Olalla P=E9rez

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