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

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0
votes
0answers
29 views

rgb2ycbcr and ycbcr2rgb performing twice on same image gives different answers? [closed]

I converted an image from rgb to ycbcr using rgb2ycbcr. Then converted back to rgb using ycbcr2rgb. Again converted the resulting image from rgb2ycbcr. But in the first and second rgb2ycbcr ...
4
votes
3answers
143 views

How to produce a matrix plot from 3 matrices a, b and c following RGBColor[a[[i,j]],b[[i,j]],c[[i,j]]]?

I am trying to produce a single-plot from 3 matrices, let's say: ...
15
votes
1answer
446 views

Is ColorDistance symmetric?

Is the function ColorDistance symmetric, i.e. is it always true that ColorDistance[a,b] == ColorDistance[b,a], as use of the ...
0
votes
0answers
29 views

Color Gradient on points using ErrorListPlot

I am having some difficulties getting a value-dependent color gradient on points with ErrorListPlot. I am starting with a list looking like ...
3
votes
2answers
72 views

Permanently Changing Default Color

I can't find this answer elsewhere, but is there a way to permanently change the default plot color? In 10 the default plots are orangish and in 9 they were a purple-bluish color. Is there a way to ...
3
votes
2answers
109 views

Matrix Plot: How to Apply color function to only a region of the plot

I want to make a matrix plot where a color function is applied to a region of a matrix. Those matrix elements which were not in the region specified should not have any color associated with them, and ...
2
votes
1answer
72 views

Duotone plots with cyan and black

What's the typical way to make Mathematica plots use purely cyan and black? Maybe there's a fairly standard method, since publishers often require this? It also seems like some plot types take ...
18
votes
3answers
606 views

How to plot an emission spectrum?

If I have a list of data with various wavelengths in nanometers, how would I plot them on a graph so it looks like this: So far I have managed to plot a spectrum in ...
0
votes
0answers
35 views

Force the Automatic BarLegend in a ContourPlot to show from -0.65 to 0

I am using ContourPlot to display a function. I have forced the ColorFunction to map between -0.65 to 0 however the automatic BarLegend is still scaled dynamically and I also want to force the ...
2
votes
1answer
63 views

Show scatter plot of change in image saturation

Let's say I have two images. One is the original and the other is after some photo-manipulation has been applied to it. I want to show the effect on the color saturation using a scatter chart. ...
4
votes
1answer
68 views

BarChart3D: varying individual bar color

I've been working with a chart like so: ...
46
votes
3answers
2k views

Python-style plots in Mathematica

I love making plots in Mathematica. And I love to spend a lot of time making high-quality plots that maximize readability and aesthetics. For most cases, Mathematica can make very beautiful images, ...
6
votes
1answer
69 views

Graph: Coloring Edges individually

CODE: Graph[{Style[0 -> 1, Red], Style[0 -> 1, {Blue, Dashed}]}] This mathematica code will make both lines solid Red, since they belong to the same two ...
2
votes
2answers
174 views

Gradient in a plotstyle

I'm trying to replicate the figure below. Now a nice first approach to do this is by using Mathematica, by making some kind of contourplot with circles and just add a gradient to the contourstyle. Now ...
1
vote
0answers
39 views

ImageData to Image to ImageData, in LABColor [closed]

Given an $m\times n$ image $G1$, I'm trying to: Extract the $mn$ pixels of $G1$ as an $n\times m$ matrix $M1$ of triples, where each triple represents the color in LAB space. Turn $M1$ into an ...
2
votes
1answer
109 views

Coloring points via “TemperatureMap” [duplicate]

I have a collection of 3D points, and each is associated with a real number in [0,1]. A typical element looks like {{x,y,z},c} where ...
0
votes
1answer
46 views

Adding circles on a function plot depending on the slope

I have the following function and I use manipulate to change the plot of the function and the integral respectively. In nonlinear dynamics one plots a little circle/point on the intersections of the ...
-3
votes
2answers
69 views

Vary the color of a 2D scatter plot [duplicate]

This is what I want. I want to change the colors as I progress through a list.
2
votes
2answers
69 views

Export Text with Colors

Is there a way of using Export[] method to take a text with colors (using Style) and then export to file, such that when I open ...
8
votes
1answer
128 views

Highlight selected points in a plot

I need to change color to selected points dynamically in my plot. ...
4
votes
2answers
161 views

Overlapping Spheres with a Shared Blank Region

We have two similar overlapped spheres in a way that the distance between their centers is smaller than the sum of their radius (2R>a). As I show here: Also, we want to draw them in a such way that ...
4
votes
2answers
122 views

Gridding in a Nested Matrix

We have a nested matrix as: nested={{he, {{e, f, g, h}, {s, 0, q, i}, {s, 0, q, j}}}, {ho, {{e, f, g, h}, {0, u, t, i}, {u, t, 0, j}}}} and with the line ...
1
vote
1answer
58 views

DensityPlot colours symmetric around zero

I have some function of two variables (which happens to be the error in some approximation I'm interested in). I'd like to get a density plot of the function, such that in regions when the function is ...
0
votes
1answer
67 views
1
vote
2answers
103 views

Controlling colors of points in ListPlot

I have a collection of points I want to plot using ListPlot[]. I would like each individual point to be a certain color depending on a key value that is based on a list separate from the points. As a ...
2
votes
1answer
42 views

Change ColorScheme of DistributionChart

The "ColorScheme"of a DistributionChart can be changed using the ChartElementFunction like in the following example: ...
2
votes
0answers
31 views

Calculating number of discernible colors in CIE La*b* space

How can Lab space be easily splitted into unity cubes and determined number of cubes that colours of certain image occupy?
12
votes
3answers
253 views

Is there any faster implementation of DominantColors?

The function DominantColors is a simple function but runs incredibly slow when the number n of dominant colors to find is large - it is currently the biggest bottleneck in my code: ...
0
votes
2answers
67 views

How to Fill ContourPlot

Given a contour plot such as function = Cos[c] + Cos[a] pltc = ContourPlot[function == 1/2, {a, 0, 4 Pi}, {c, 0, 4 Pi}]; How can I color the regions in which ...
2
votes
2answers
117 views

Make a colored ListPlot

Basically I have a set of 3D points, such as {3,4,3} or {4,1,4}. Instead of plotting the points in a 3D space, I want to plot the x,y coordinates of the points on the 2D plane and use the z coordinate ...
0
votes
1answer
41 views

Strange output of ColorFunction

In v10.0.2, compare the following two outputs: Plot3D[x^2 + y^2, {x, -2, 2}, {y, -2, 2}, ColorFunction -> (Hue[Sqrt[#1^2 + #2^2]] &)] ...
0
votes
1answer
58 views

Coloring circles based on radius

I have a list of ellipses with x and centroid, orientation, and major diameter and minor diameter. I currently have them overlaid on an image in red but what I would like is to be able to colour them ...
2
votes
2answers
741 views

How do I find the average color of an image?

It sounds so simple to do, but the best solution I've found so far is by using the MeanFilter function, which isn't really feasible on large images. Can anyone help ...
1
vote
2answers
131 views

Using Specularity effects and ColorFunction in Plot3d

I'd like to reproduce the 3d surface of the attached image . What I'm interested in, is the light reflection at the basis of the surface and the rainbowlike color. I use Plot3d and colorfunction in ...
0
votes
0answers
55 views

ContourPlot color problems

I tried to use contourplot to a 2D fucntion with rescaled color, the code is given below ...
0
votes
1answer
38 views

Manually choosing colors in ListPlot

I have a ListPlot of 4 data sets (tables) and I want to manually choose what color each one has. data1 = Table1 data2 = Table2 etc. and then ...
1
vote
2answers
75 views
0
votes
2answers
54 views

How do I color an Image generated from data such that one range of values is one color gradient and the others another color gradient [closed]

I can generate a Gray scale Image from some data that I collect. However I am trying to figure out how to generate the image with two color gradients or color scales based on the value. For example ...
2
votes
2answers
65 views

Can i change AutoStyles colors for undefined variables?

I want to change from blue to red the color of the undefined variables; but only for the current Notebook
15
votes
2answers
407 views

White balance correction with Mathematica

Does Mathematica include a function to correct the white balance of an image? ImageAdjust would seem to be the first go-to choice, but I haven't found a way to ...
5
votes
3answers
188 views

mixing color of individual parts of a function in DensityPlot

I have a function which is a sum of three terms and I want to plot it in a DensityPlot. However, I would like that the ColorFunction would be the RGBColor resulting of the mixed R color corresponding ...
2
votes
1answer
79 views

Change the colors of individual atoms in a .mol or XYZ file

Similar to (Changing the atom color for plotting xyz-files), I want to take a molecule and then simply change the colors of individual atoms. I don't want to change all atoms of a type to a color ...
4
votes
1answer
79 views

What are all the Properties that ColorData supports?

The documentation for ColorData reads: Possible properties in ColorData["scheme","property"] include: ...
14
votes
1answer
192 views

Major slowdown when using a ColorFunction with more than one named scheme

Problem remains in 10.1 Earlier Kuba noted a major slowdown with code Simon Woods posted. Here is a simplified example. First a color function using two different named gradient schemes: ...
5
votes
4answers
181 views

Coloring an image with two Color schemes based on a Range

I would like to color an image generated from some data using two colorschemes based on two ranges of the data. This is my attempt. ...
0
votes
0answers
14 views

How to converrt RGB to YCbCr [duplicate]

While converting rgb to Ycbcr, do we get values as floating point numbers? I would like to have Y, Cb, Cr values as integers. Is it possible?
6
votes
2answers
171 views

Color lines by angle

I would like to color some lines according to the following color function: ...
1
vote
1answer
91 views

Piecewise ColorFunction for Plot3D

I want to make a 3D plot where the ColorFunction is different depending on whether the function value is positive or negative. I know how to do the following: ...
3
votes
2answers
66 views

How do I apply a ColorDataFunction[] to a grayscale image? [duplicate]

Suppose I have a 2D array im of real values between 0 and 1, representing a grayscale image. I can turn im into an image very ...
1
vote
1answer
138 views

Adjusting contrast of a color scale with ListDensityPlot

I am using ListDensityPlot to plot data of the form {{x1,y1,z1},{x2,y2,z2}, …}. It results in the plot shown below. But I'd like to adjust the color scale contrast to better show the variations in ...