Questions on the color models, schemes, named colors and color functions supported by Mathematica.

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17
votes
2answers
368 views

Pattern that matches colors

Suppose I'm writing a function that takes a color as a parameter; for example: drawShape[color_] := Graphics[{Style[Disk[], color]}]; But if the caller inputs an ...
1
vote
2answers
96 views

ColorFuntion input

Is there any input for ColorFunction, which ranges from Black for smallest values, goes through red-orange-yellow and ends in very bright yellow almost white for ...
5
votes
5answers
194 views

Providing a color function for ListPointPlot3D

Is there a way to write ListPointPlot3D expression, so when given a list of points, the the color of the points plotted is a function of the index/element number of ...
2
votes
1answer
114 views

Two discrete colors for surface with ParametricPlot3D

I am trying to create a plot of a surface that is yellow above the xy-plane (z>0), but blue below (z<0). My first attempt was to use ...
2
votes
1answer
59 views

Having variables appear aqua in user defined function [duplicate]

In many of the inbuilt mathematica function, variables appear aqua like in: However, when creating your own function, variables no longer have that green coloring and are instead colored like an ...
21
votes
5answers
534 views

Compiling ColorFunction for faster complex phase-amplitude plots

I have gotten into the habit of plotting complex-valued functions on a plane using a color-function along the lines of ...
0
votes
1answer
110 views

Density map strange mapping of color

I tried to convince Mathematica 8 to plot a density map of a function: $$f(x,y) = \frac{2(x^2 - y^2)-1}{(x^2 + y^2)^2}$$ with color scheme called "TemperatureMap". At $x = \pm 1$, $y = 0$ it's ...
1
vote
2answers
91 views
0
votes
0answers
84 views

complicated color function and color bar legend (summary of the results from previous relevant posts)

At first let me apologize. I should have read the policies of this forum before attempting a post. I was more accustomed to a moderated forum like MathGroup than such an active one like the ...
2
votes
1answer
94 views

Coloring a set of polygons, each polygon to have a specific color

In addition to my previus post, regarding plotting the surface of a Möbius strip, I now realised, that some of the eigenmodes for a Möbius strip are either oscillations of a scalar field OR a vector ...
0
votes
0answers
77 views

puzzled with ColorData

At first let me thank, from this point as well, those that they replied to my previous queries. From a reply I got, I obtained finally the desired graph. ...
1
vote
1answer
97 views

Identifying the color in Image

This has mad me Crazy for a while Can any one please Help me solving this this is the Image that I am working on . Basically this image is made up of 98 different color patches 7 patch on each level ...
3
votes
3answers
271 views

Using a complicated function as color function

I have an ellipsoid with parametric equations lst = {10*Cos[u]*Sin[v], 3*Sin[u]*Sin[v], 2*Cos[v]}; I define a function ...
1
vote
1answer
326 views

add a color bar legend to a 3D plot

This has a connection to the previous post here: puzzled with a color function Also, a recent post of mine appeared here: Create a color bar plot legend but I should have solved the problem with the ...
2
votes
1answer
304 views

White regions in DensityPlot — is this a bug with ColorFunctionScaling?

Is this a bug with ColorFunctionScaling? When I try to supply my own ColorFunction Mathematica seems to partially ignore it, ...
8
votes
3answers
767 views

256 Shades of Grey

I noticed that the following line, Image[Table[x, {y, 1, 250}, {x, 30/256, 40/256, 0.02/256}], Magnification -> 1] results in the following image: In the ...
3
votes
1answer
96 views

How to color a BSplineSurface

I am trying to color a BSplineSurface in a complex way but not having any luck using ColorFunction. I can use ...
1
vote
0answers
41 views

Colouring of multiple data sets in DiscretePlot [duplicate]

I noticed the following strange behaviour: Let us first define an array of functions g[k_] := {Sin[k], 2*Sin[k]} gg = g[k] When I plot this array of ...
5
votes
2answers
180 views

How to color separate a colored-in-pencil drawing?

I'd like to pick out just the "pencil" color in some drawings done by a young member of the household (he'd like to print out copies of these pictures and distribute them to his class mates on the ...
3
votes
1answer
263 views

How to make custom discrete color data function

Attempting to make custom discrete color data function: my custom color: is it possible to use my custom color ...
0
votes
4answers
160 views

Plot graphs with ListPointPlot3D and different colours and size of points

Hello I am New in Mathematica. I have a set of points and I want to visualize in Wolfram Mathematica. I want to see big blue points and small green points in one picture. Big Blue points ...
0
votes
1answer
95 views

shade plane with a color function color(x,y)

I am making a RGB color function which assigns an RGB color to each point in the plane. To check if it does what I think it should do (i.e. debugging it), it is helpful to be able to plot the function ...
1
vote
1answer
133 views

Plot a vector valued function of two variables using color density

I have a vector (3D) valued function of two variables. I want to visualize it as a density plot, using R,G,B color values to display the value at the point (x,y). I've come up with a couple of ...
0
votes
2answers
161 views

ListLinePlot with colors from data

I am trying to color a simple 2D plot (using ListLinePlot) based on data in the form of 3-vectors. ...
3
votes
1answer
126 views

Giving a custom style a colored gradient background

In Mathematica, customizing Sections, Subsections, Titles and so on, can be done with Format > Style > .... Changing the background color of a style is one of the things you can do. Here is an example ...
3
votes
1answer
83 views

ArrayPlot of square matrix: how does ColorFunction -> Automatic work?

Suppose you have the following: tt = Table[{i, j}, {i, 0, 10}, {j, 0, 10}] The table tt is a matrix of pairs, ...
0
votes
1answer
56 views

Importing colors from file

I just tried something straightforward (for me): ...
1
vote
2answers
115 views

How can I remove edges from my DiscretePlot?

By default, DiscretePlot displays "edges" along the sides and, prominently, align the top when ExtentSize -> Full is set. For ...
0
votes
0answers
62 views

Solving a system of three differential equations

I'm trying to create this coloured graph which I'm going to animate, but I'm stuck with solving a system of three differential equations: ...
20
votes
4answers
627 views

How can I get the color of overlapping disks to be equal in any order?

When Graphics is used, necessarily the objects come in order. This affects which ones obscure others. When Opacity is not 1, it also affects the color. I would like the color of overlaps to depend ...
3
votes
2answers
199 views

Contour coloring and (List)ContourPlot projection

I have two questions concerning (List)ContourPlots. Since they are related to a single visualization desire, I have combined the questions into a single post. I'm hoping that they will be easy to ...
7
votes
2answers
167 views

Why does StreamColorFunctionScaling refuse to turn off?

Consider this simple streamline plot: StreamPlot[{-y/10, x/10}, {x, -1, 1}, {y, -1, 1}, StreamColorFunction -> Function[{x, y, u, v}, Hue[v]]] The ...
0
votes
0answers
140 views

Visualization of Gaussian Curvature

I need to visualize Gaussian Curvature of a parametric surface. there is a solution here How to visualize the Gaussian curvature of a 3D surface? but Im not sure its working because when I draw a ...
0
votes
1answer
113 views

ListDensityPlot with discrete bins [duplicate]

We consider a table of the form data = Flatten[Table[{i,j,f[i,j]},{i,1,ni},{j,1,nj}],1] The function f[i_,j_] has been made ...
5
votes
1answer
334 views

Apply color function to matrix plot

I want to apply the following color rules to a large table of numbers. I have extracted a part of the table to use as an example. I would like to assign 5 different colors to 5 different ranges of ...
6
votes
2answers
419 views

Combining three R, G, B matrices into a single matrix of 3-tuples?

Working with Mathematica 8 on OSX here. I have three $1024 \times 1024$ matrices representing the counts from consecutive exposures onto a CCD with $R$, $G$, and $B$ filters on it, and am looking to ...
3
votes
3answers
174 views

Center Diverging color map on a matrix plot

I want to use the color function "RedBlueTones" and I want to center the map at a number. Then I want to blend in the red direction of I am greater than that number and blend in the blue direction if ...
3
votes
1answer
182 views

Plotting with ColorFunction -> GrayLevel - no black

This is probably a fairly trivial question, yet I have been unable to find an answer - help would be much appreciated! :) I am trying to plot a 28 x 28 matrix (tabulated data given here), containing ...
11
votes
5answers
589 views

Default Chart Color Doesn't Match

I have looked through other posts to find out what the default plot color is, but when I use it, the color doesn't seem to match. Can anyone explain why I'm seeing different output? The reason I ask ...
0
votes
1answer
44 views

How to known exactly what color assign “TemperatureMap” to a particular value? [closed]

Usually ColorData["TemperatureMap"] is using to coloring graphs and show how near is any value to 0(Blue), 1(Red), or in the mean (White). The question is: How ...
7
votes
3answers
257 views

Different colors for nodes in tree plot

I have some list of numbers which I am plotting using TreePlot. This is the code: ...
0
votes
2answers
167 views

How can I get a PieChart to be colored as I wish?

How to use the value of a funtion[label] to assign color to a piece of the pie? (edited after answer of kguler ) My dude is how to control the colors in ranges of a function of [labels] In this way ...
6
votes
2answers
249 views

Formatting text through pattern matching

I am trying to format some text based on some patterns. ...
9
votes
1answer
1k views

Logarithmic scale in a DensityPlot and its legend

I was recently faced with the task of creating a DensityPlot with a logarithmic colour scale, and with providing it with an appropriate legend. Since I could not find any resources to this effect on ...
3
votes
3answers
282 views

Colorize a 3D distribution of points according to density

Suppose we have some random 3D distribution of points. I'll use the spherical ball defined below as an example and a starting point for the discussion here : ...
0
votes
0answers
17 views

different densityplots with same color range [duplicate]

for example, lets say there're two functions f1 and f2. 0<=f1<=1, 2<=f2<=3 but the two differs only by constants. (e.g. f1[x_,y_]:=(Sin[x]Sin[y])^2, f2[x_,y_]:=(Sin[x]Sin[y])^2+2) what i ...
3
votes
1answer
121 views

How can I change label colors in a colored chart?

I am trying to make a chart with labels, but I would like for the labels on the chart to be white for purposes of visibility. I am aware of the ...
0
votes
1answer
203 views

Calculate the centroid of a group of pixels with the same PixelValuePositions

My question is about how to recognise objects in a image. I would like to recognise objects of the same color. Then I want to calculate the centroid of these objects. I want to apply this calculation ...