User-defined color themes

With Blend function, it is quite simple to use user-defined color themes.

Blend[{col₁, col₂, col₃, ...}, x]: linearly interpolates between colors col_i as x varies from 0 to 1.

We like to use the following color theme:

c = {{37, 57, 175}, {40, 127, 251}, {50, 190, 255}, {106, 235,
    255}, {138, 236, 174}, {205, 255, 162}, {240, 236, 121}, {255,
    189, 87}, {255, 161, 68}, {255, 186, 133}, {255, 255, 255}};

colors = RGBColor[#/255] & /@ c;

This shows the each color in the theme:

Graphics[Table[{EdgeForm[Black], FaceForm[colors[[i]]],
   Rectangle[{i, 0}, {i + 1, 1}]}, {i, 1, Length[colors]}]]

Check the color theme with Blend function:

DensityPlot[x, {x, 0, Length[c]}, {y, 0, 1}, AspectRatio -> Automatic,
  FrameTicks -> None, ColorFunction -> (Blend[colors, #] &),
PlotRangePadding -> None]

Then you probably notice how to use it in your own plot,

ColorFunction -> (Blend[colors, #] &)

Test the color theme with the data:

ReliefPlot[data, ColorFunction -> (Blend[colors, #] &)]

Maybe the ligher color is better.

lightercolors = Lighter[#] & /@ colors;

Just for fun, let’s play the color theme with an existing image.

img=ImageData[ColorConvert[place_any_image_here, ”Grayscale”]];

ArrayPlot[img, ColorFunction -> (Blend[darkercolors, #] &)]