Hi Jon,
Thanks for pointing this out - I'll add a bit to the tutorial.
Meanwhile, one way of creating a style to display a raster is like this...
StyleFactory factory = CommonFactoryFinder.getStyleFactory(null);
StyleBuilder sb = new StyleBuilder(factory);
ColorMap cm = sb.createColorMap( ... ); // see below
RasterSymbolizer sym = sb.createRasterSymbolizer(cm, 1.0);
Style style = sb.createStyle(sym);
The colour map for the style can be used to define a ramp of colours,
or a series of intervals with breakpoints, or a set of colours for
specified values. Which you choose depends on the example data that
you are working with. Have a look at this page in the javadocs:
http://javadoc.geotools.fr/2.5/org/geotools/styling/StyleBuilder.html#createColorMap(java.lang.String[],%20double[],%20java.awt.Color[],%20int)
Let us know how you go and, if the above was useful, I'll update the tutorial.
cheers
Michael
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