Re: Documentation on (Color) Blend

*To*: mathgroup at smc.vnet.net*Subject*: [mg111274] Re: Documentation on (Color) Blend*From*: Ryan Gorka <rgorka at gmail.com>*Date*: Mon, 26 Jul 2010 06:35:59 -0400 (EDT)

Patrick and David: Thanks for the help. Once I generate something I like, such as DensityPlot[x, {x, -1, 1}, {y, 0, 1}, FrameTicks -> None, ColorFunction -> (Blend[{{0, Green}, {0.4, White}, {0.6, White}, {1, Red}}, #] &)] Do you have any suggestions for the best way (or at least a reasonable way) to pick a range of x colors from that? I'll probably start with a linear sampling, although non-linear samplings also interest me---my main goal is to avoid injecting 'lie factor' via coloring in my diagrams, so any wisdom you can impart is appreciated. BTW, are there any Edward Tufte fans in here? I suppose for now I can just use //InputForm, Part[] and go digging for RGB values. -RG On Sun, Jul 25, 2010 at 7:04 PM, Patrick Scheibe < pscheibe at trm.uni-leipzig.de> wrote: > Hi, > > you don't need the (buggy) sample with the Table. Just read a bit in the > Blend documentation and eventually do something like > > DensityPlot[x, {x, -1, 1}, {y, 0, 1}, FrameTicks -> None, > ColorFunction -> (Blend[{{0, Green}, {0.4, White}, {0.6, White}, {1, > Red}}, #] &)] > > Cheers > Patrick > > On Sun, 2010-07-25 at 01:58 -0400, telefunkenvf14 wrote: > > Group: > > > > The documentation on Blend[], in the "Possible Issues" section, > > contains the following example. > > > > ---------------- > > In plot functions, use ColorFunctionScaling to control global scaling > > of variables: > > > > Table[DensityPlot[x, {x, -2, 3}, {y, 0, 1}, FrameTicks -> None, > > ColorFunction -> (Blend[{Red, Green}, #] &), > > ColorFunctionScaling -> t], {t, {False, True}}] > > ---------------- > > > > I noticed that when I evaluate the code, the original output is not > > reproduced. On my machine the new plots look exactly the same. > > (Windows 7, 64-bit, Mathematica 7.0.1) > > > > Can someone offer a fix? My goal is to generate a Green to White to > > Red spectrum with a 'fuzzier' center; eventually I'll use this for > > coloring a map. > > > > -RG > > > >