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MathGroup Archive 2007

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Raster, Color Function as Pure FunctionI

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81389] Raster, Color Function as Pure FunctionI
  • From: lamoucheg at gmail.com
  • Date: Fri, 21 Sep 2007 03:12:57 -0400 (EDT)

If "Dynamic updating" is disabled  in the menu "Evaluation", the
following graphic shows up:
Graphics[Raster[{{0, 0.2, 0.4}, {0.6, 0.8, 1}}, ColorFunction -> Hue]]

while the following two don't:
Graphics[Raster[{{0, 0.2, 0.4}, {0.6, 0.8, 1}}, 
  ColorFunction -> (Hue[#1] & )]]
Graphics[Raster[{{0, 0.2, 0.4}, {0.6, 0.8, 1}}, 
  ColorFunction -> (RGBColor[#1, #1, 1 - #1] & )]]

Everything shows up finely with Dynamic Updating enabled. Obviously,
the treatment is more complex when pure functions are used to specify
the color scale. But why through dynamically evaluated things?

Anybody can shed light on the rendering process when pure functions
are used with Graphics[Raster[]]? Note that it is not the case when
ArrayPlot is used, even with Dynamic Updating disabled, pure functions
can be used for ColorFunction.

Thanks.

Guy Lamouche


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