MathGroup Archive 2001

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Raster and ColorFunctionScaling

  • To: mathgroup at
  • Subject: [mg31560] Raster and ColorFunctionScaling
  • From: "David Park" <djmp at>
  • Date: Sun, 11 Nov 2001 00:34:51 -0500 (EST)
  • Sender: owner-wri-mathgroup at

Dear MathGroup,

Is there any explanation for the strange behavior of the
ColorFunctionScaling option when used with the Raster graphics primitive.
When set to True it simply clamps z < 0 to 0 and z > 1 to 1. But in
ContourPlot and DensityPlot the minimum and maximum z values in the plot are
found and then scaled to 0 and 1. It is certainly easy enough for
Mathematica to find the minimum and maximum values in the raster array, so
why doesn't Mathematica do the same kind of scaling with Raster? It is
inconsistent and confusing usage.

David Park
djmp at

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