How to get the rgb code from Matlab figure

Question

Khalid Ibne Masood 2020-4-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/521544-how-to-get-the-rgb-code-from-matlab-figure

编辑： Adam Danz 2020-4-29

Question.jpg

Hello Everyone,

I have attached a matlab figure here. This plot was generated from Matlab and I need to know the RGB color code for each color used in this picture. I know that there are exactly 5 colors have been used for this plot, I need to extract these 5 colors. Please help me to solve this problem.

Thank you.

Khalid

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Adam Danz 2020-4-29

编辑：Adam Danz 2020-4-29

Do you have the fig file (if so, attach it) and do you know which function was used to generate the plot?

Khalid Ibne Masood 2020-4-29

Question.fig

Hello Adam,

Thank you, here I have attached the .fig file.

I believe 'surf' was used to generate the plot.

Thank you.

Khalid

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Answer 1

Adam Danz 2020-4-29

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/521544-how-to-get-the-rgb-code-from-matlab-figure#answer_429049

编辑：Adam Danz 2020-4-29

在 MATLAB Online 中打开

Retreiving the colors from a surface plot can be trickly due to the interaction between the color properties of a surface object. If you plan to apply this solution to a variety of surface plots with varying color properties, you'll need to carefully read about the color properties and how they interact with eachother: https://www.mathworks.com/help/matlab/ref/matlab.graphics.chart.primitive.surface-properties.html#d120e1097631

See inline comments for details.

% Open the figure 
fig = openfig('Question.fig'); 
% Find the axis handle
ax = findobj(fig, 'Type', 'axes'); 
% Find the surface handle
surfObj = ax.Children;  
% Get the colormap
cmap = ax.Colormap; 
% scale the color data values to the range of the 
% colormap to match the color data with the colormap rows.
cval = round((surfObj.CData - ax.CLim(1))./range(ax.CLim) .* (size(cmap,1)-1)) +1;
% List the unique colors in order from left to right. 
uniqueRGB = cmap(unique(cval(:),'stable'),:);

Results:

uniqueRGB =
          0.5            0            0
       0.9375            1       0.0625
       0.5625            1       0.4375
       0.4375            1       0.5625
            0            0       0.5625

Plot a large dot above each color section to check the results

% Add dots to plot to confirm color
hold on
h = scatter3([.1 .35 .6 .80 .95], repmat(1,1,size(uniqueRGB,1)), repmat(max(ax.ZLim),1,size(uniqueRGB,1)), ...
    200, uniqueRGB, 'filled', 'MarkerEdgeColor', 'k', 'LineWidth', 2);