Color Blend in Different Color Spaces 

The relationship between two colors is deeply influenced by the color model that is used to describe them. The function Blend performs a color mixing in the color's native space, thus preserving its natural metric and its characteristics.

Blend offers unique results depending on the color model.

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X Blend@ColorConvert[{RGBColor[0, 0, 1], RGBColor[1, 1, 0]}, "RGB"]

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X Blend@ColorConvert[{RGBColor[0, 0, 1], RGBColor[1, 1, 0]}, "HSB"]

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Compare blue-to-red blend in RGB and HSB spaces.

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X ArrayPlot[{Table[ Blend[ColorConvert[{Blue, Red}, "RGB"], n], {n, 0, 1, .01}]}, AspectRatio -> .25]

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X ArrayPlot[{Table[ Blend[ColorConvert[{Blue, Red}, "HSB"], n], {n, 0, 1, .01}]}, AspectRatio -> .25]

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A 3D representation of an RGB blend is a straight line in RGB itself but a curve in a perceptually accurate space like CIE .

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X data = Table[ Blend[ColorConvert[{Blue, Red}, "RGB"], n], {n, 0, 1, .01}]; Labeled[ ChromaticityPlot3D[data, #, Ticks -> None, ViewPoint -> {1, -2, -1}], #] & /@ {"RGB", "LAB"}

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Blue-to-red blend in four different color spaces.

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X Column[Labeled[ ArrayPlot[{Table[ Blend[ColorConvert[{Blue, Red}, #], n], {n, 0, 1, .01}]}, AspectRatio -> .25], #] & /@ {RGBColor, Hue, XYZColor, LCHColor}]

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Use red-to-blue (center to corner) blend in different spaces for coloring plots.

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X Table[ContourPlot[ If[c === "RGBColor" || c === "XYZColor", y + Sin[-x^3 + y^3], y + Sin[x^3 + y^3]], {x, -2, 2}, {y, -2, 2}, Contours -> 3, Frame -> None, ContourStyle -> Directive[Thick, Hue[.125, 1, 1, 1]], ColorFunction -> (Darker[ Blend[ColorConvert[ If[c === "LCHColor" || c == "XYZColor", {Blue, Red}, {Red, Blue}], c], #1]] &), PlotRangePadding -> None], {c, {"Hue", "RGBColor", "XYZColor", "LCHColor"}}]

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