Intensity Interpolation

[Matthew A Tobiasz <matobias ucalgary ca>]

Hello,

This is more of an applied GTK question:

I was wondering if anyone knew here I could get some information about 
intensity interpolation eg. Gouraud shading. I'm trying to make a colour 
scale in a GtkDrawingArea: I have two GdkColours, and I'm trying to figure 
out some reasonable way to interpolate the colour that are between these two.  
Traditionally I've done this in a linear fashion, however I've been reading 
about Gouraud shading 
        see: http://www.fastgraph.com/help/gouraud_shading.html for a picture
but I can't seem to find how to do it (or for that matter how it really works) 
in a colour scale applications. 

Sincerely,
Matthew
--
www.ucalgary.ca/~matobias
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