Re: ContourPlot and ColorFunction Opacity

*To*: mathgroup at smc.vnet.net*Subject*: [mg93749] Re: ContourPlot and ColorFunction Opacity*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Mon, 24 Nov 2008 06:45:33 -0500 (EST)*Organization*: Uni Leipzig*References*: <ggdqq9$k5$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de

Hi, if you don't like to define your own color function ContourPlot[Cos[x y], {x, -Pi, Pi}, {y, -Pi, Pi}, GridLines -> Automatic, RegionFunction -> Function[{x, y, z}, Pi < x^3 + y^3 < Pi^3], BoundaryStyle -> Red, ColorFunction -> "TemperatureMap"] /. {EdgeForm[], c_RGBColor, g_GraphicsGroup} :> {EdgeForm[], Append[c, 0.5], g} will work Regards Jens alpinekarst wrote: > Dear All, > > I am hoping that one of the Gurus here can help me figure out how to > adjust the opacity for a ContourPlot ColorFunction in Mathematica 6.0.3 > > say for example I have a 2D ContourPlot plot such as: > > ContourPlot[Cos[x y], {x, -Pi, Pi}, {y, -Pi, Pi}, > GridLines -> Automatic, > RegionFunction -> Function[{x, y, z}, Pi < x^3 + y^3 < Pi^3], > BoundaryStyle -> Red, ColorFunction -> "TemperatureMap"] > > How can I adjust the Opacity of the filled region so that the > gridlines are somewhat visible within the boundary defined by the > RegionFunction? Using a constant would be fine or even better some > generic decay function from the centroid of the region. > > I have tried defining the opacity in the color function multiple ways > such as: > {Directive[Opacity[0.5]], ColorData["TemperatureMap"][#1] &} > but keep getting BoxForm and Graphics Directive errors. > > I'm thinking of resorting to replacement rules against AbsoluteOptions > but that's bound to get ugly and I am hoping that there is a better > way? This is probably quite simple...but not for me today. > > Thanks. >