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I am using the options PlotTheme -> "Scientific" and PlotLegends -> Placed[Automatic, Right] on a MatrixPlot and I would like to change the font size of the legend labels.

I would usually do that by specifying

BarLegend[{"LakeColors", {0, 1}}, LabelStyle -> {FontSize -> 20}]

but

  • I don't know the color function used by the base theme "Scientific" and

  • I would like to keep the range of min and max values {0,1} as Automatic

What would be the best way to change the legend font in this case?

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This is straightforward. All of the legend functions accept the generic, top level arguments, e.g. LineLegend[Automatic] which allows you to modify the behavior. So, you would use BarLegend[Automatic, LabelStyle -> {FontSize -> 20}].

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  • $\begingroup$ To the random downvoter, why? Is my answer incorrect? Too short? What? $\endgroup$ – rcollyer May 1 '17 at 18:35
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You can see what ColorFunction was used for the graphics as follows.

data = RandomReal[1, {4, 4}]; 
MatrixPlot[data, PlotTheme -> "Scientific", 
PlotLegends -> 
Placed[BarLegend[Automatic, LegendLayout -> "Column", 
LabelStyle -> {FontSize -> 20}], After]] // InputForm

(*Legended[Graphics[Raster[{{{0.4461453382422279, 0.491477006229007, 
   0.7637054679655062, 1.}, {0.3154254478896804, 0.3694472079594942, 
   0.65486047117729, 1.}, {0.7569822664902999, 0.7361394855201956, 
   0.7844867644266112, 1.}, {0.9143712804788171, 0.8600217622903947, 
   0.7950091556297764, 1.}}, {{0.6337218541194113, 0.6391201311626331, 
   0.7762460731231854, 1.}, {0.35374427405760145, 0.4143282314629484, 
   0.7344141311061161, 1.}, {0.4107447677037708, 0.46361290589486254, 
   0.7613387293820364, 1.}, {0.6601415148287806, 0.6599152784046868, 
   0.7780123844964757, 1.}}, {{0.5282720496463704, 0.5561196628831526, 
   0.7691961268350438, 1.}, {0.33466924070697635, 0.39198654969047086, 
   0.6948124817847957, 1.}, {0.47836178822829944, 0.5168348572796462, 
   0.7658593291616591, 1.}, {0.6966959644875594, 0.6886876071400427, 
   0.780456266758513, 1.}}, {{0.8161315485390368, 0.782696405497182, 
   0.7884412455516316, 1.}, {0.292198, 0.342242, 0.606638, 1.}, 
   {0.5970079564384867, 0.6102222994870824, 0.7737915308130096, 1.}, 
   {0.30371427829734576, 0.35573047051500206, 0.6305469288199474, 1.}}}, 
   {{0, 0}, {4, 4}}, {0, 1}], Axes -> False, Frame -> True, 
  FrameLabel -> {None, None}, FrameStyle -> Automatic, 
  FrameTicks -> {{{{3.5, 1}, {2.5, 2}, {1.5, 3}, {0.5, 4}}, 
     {{3.5, 1}, {2.5, 2}, {1.5, 3}, {0.5, 4}}}, 
    {{{0.5, 1}, {1.5, 2}, {2.5, 3}, {3.5, 4}}, {{0.5, 1}, {1.5, 2}, {2.5, 3}, 
      {3.5, 4}}}}, GridLines -> None, GridLinesStyle -> 
   Directive[GrayLevel[0.5, 0.4]], LabelStyle -> {FontFamily -> "Times"}, 
  Method -> {"AxisPadding" -> Scaled[0.02], "DefaultBoundaryStyle" -> Automatic, 
    "DefaultPlotStyle" -> Automatic, "DomainPadding" -> Scaled[0.02], 
    "RangePadding" -> Scaled[0.05]}], 
 Placed[BarLegend[{Blend[System`PlotThemeDump`$ThemeColorMatrix, #1] & , 
    {0.5478712433217057, 1.}}, LabelStyle -> {FontSize -> 20}, 
   LegendLayout -> "Column", Ticks -> {{0.6506512323727816, 0.3}, 
    {0.7410419717964505, 0.48}, {0.8264110034743599, 0.65}, {0.9117800351522696, 
    0.8200000000000001}, {0.565282200694872, 0.13}, {0.997149066830179, 0.99}}, 
   "PinningPoint" -> 0.5, "SmoothRange" -> False, Charting`TickSide -> Right, 
   ColorFunctionScaling -> False], After, Identity]]*)

The ColorFunction used by BarLegend is specified in the output

Blend[System`PlotThemeDump`$ThemeColorMatrix, #1] &
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