Re: Intensity Interpolation

[Peter Krueger <pkrueger appss de>]

On Sun, 7 Mar 2004, Matthew A Tobiasz wrote:
> 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.
Hello Matthew,
since you only have two colors, linear color scaling will work fine.
Shadings like Gouraud and Phong come from 3D-computer graphics. The
Gouraud shading you mention takes a polygon and interpolates the given
colors of its vertices over the face. This is also done by combining
linear color interpolations.
Since you only have two colors, a Gouraud shaded face would look exactly
like the much simpler linear color interpolation face.

Regards,
                  Peter
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