How to draw colors on CIE 1931 Color Space in Matlab?
I am trying to plot multiple color values (coordinates) on an already plotted CIE 1931 color space. I got the XYZ color values that I want to plot indicated as [X, Y, Z]
-
[50, 57, 10]
[36, 43, 15]
[28, 36, 8]
[25, 32, 14]
I am using this function which renders the whole CIE color space - http://www.mathworks.com/matlabcentral/fileexchange/40640-computational-colour-science-using-matlab-2e/content//cieplot.m
cieplot();
hold on
x=[0.42 0.58]
y=[0.48 0.45];
scatter(x,y);
hold off
I have used the below two formulas to calculate the values x
and y
used in the above code to plot 2 colors as an example and generate the picture / graph shown. One of the two colors is outside the desired color spectrum. I am confused as to how to plot a coordinate z
that can be calculated as z=1-x-y
in the shown CIE color space so that all colors fit the spectrum.
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As pointed out by horchler , the error was in my color conversion (RGB to XYZ to xyY) which I made external to MATLAB. While fixing the error, the following code gave the desired result.
cieplot(); hold on x=[0.42 0.38 0.388 0.352 0.344 0.281] y=[0.48 0.45 0.5 0.45 0.452 0.352]; scatter(x,y,10,'filled'); i=1; a=[1 2 3 4 5 6]; strValues = strtrim(cellstr(num2str(a(:),'(%d)'))); text(x,y,strValues,'VerticalAlignment','bottom'); hold off
The graph shows six colors plotted in the CIE 1931 color space according to their values x
and y
.
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