I'm wondering if it is possible to get the list of RGBColor from a plot.

What I mean is simple. Suppose I plot list L with "TemperatureMap":

P1=ListPlot[L,ColorFunction -> ColorData["TemperatureMap"]]

Getting a simple plot:

enter image description here

Can I retrieve from the graphics object P1, the list of RGBColor elements used? (i.e. the color values for each dot in the ListPlot)

colorList= {RGBcolor[],...,RGBcolor[]}




1 Answer 1

coordsandcolors = DeleteDuplicates @ Cases[P1, GraphicsComplex[coords_, __, 
   VertexColors -> colors_] :> Transpose[{coords, RGBColor @@@ colors}], All][[1]]


enter image description here

  • $\begingroup$ Wow, I must admit I don't quite understand how this works, but it does. Thanks a lot! $\endgroup$ Sep 27, 2019 at 3:41
  • 3
    $\begingroup$ It is worth to note that ListPlot behaves this way only in version 12.0. In version 11.3 it produces a plot with all the points of identical color. And in version 12.0 we have a bug: applying Normal changes the plot to the previous version's styling (just removes VertexColors information). $\endgroup$ Sep 27, 2019 at 3:49
  • $\begingroup$ @AlexeyPopkov, excellent points. (Actually, Normal[P1] was my first try.) $\endgroup$
    – kglr
    Sep 27, 2019 at 3:53

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