set_facecolor ( 'k' ) # Make sure our circles are circular! ax. format ( T ), xy = ( x, y * 1.2 - 0.5 ), va = 'center', ha = 'center', color = html_rgb ) # Set the limits and background colour remove the ticks ax. Your computer cannot display violet, do not make people thinking that colour with low x,y is violet (it is not). The colormap MAP can either be a Matlab or a userdefined colormap. For each xy coordinate of my diagram I need to determine the corresponding Y value to obtain the complete xyY representation, from which XYZ tristimulus values can be calculated and finally sRGB values derived. The condition vector C is independent of the values of X and Y but must be the same size. Starting with xy coordinates I would like to plot a chromaticity diagram displaying just the sRGB gamut portion of the CIE xy chromaticity diagram. The basic strategy is to make a grid of points in RGB space, transform them to Lab space, and find the boundary. Plots the vector Y versus vector X using conditional coloring based on colormaps. lab rgb2lab (rgb) labp lab (:,:, 1 3 2) rgbp lab2rgb (labp) imshow (rgbp) Now let's get to work on visualizing the sRGB gamut surface. Now you can plot in x,y diagram a RGB colour (and in the correct place). Conditionally Colored Plot (CCPLOT) Plots conditionally colored (2D line) graphs. There is no unique way to do this, but the formulation used here is based on the CIE colour matching functions, $\bar K'. If you want to do properly, select 16x16x16 RGB values, calculate they X,Y,Z and then x,y. The values of u and v can be calculated from the tristimulus values XYZ (or X10Y10Z10) or from the chromaticity coordinates xy according to the following. For the complete Matlab or Octave novice, please have a look at Getting Started with MATLAB and/or GNU Octave, Getting Started. This guide assumes some basic familiarity with Matlab. The software also shows the position of the co-ordinates in chromaticity diagram and expected color of the material. You may want to rename the unzipped folder from gamut-volume-m-master to gamut-volume-m to be consistant with the git instructions above. I have the data for the standard 2deg (I think) observer (I can't find a link) - you will need to divide by X+Y+Z to convert from XYZ to xyz. Plot along with the convex hull and/or the spectral line you calculated. If you copy and paste from Matlab you get this \documentclass Matlab code to make the shape of the locus cie.lambda = Ĭie.cmf2deg = 1.0e+02 * Ĭie.illE = ones(length(cie.lambda),1) %equal energy illuminantĬie.cmf2deg = interp1(cie.cmf2deg(:,1),cie.cmf2deg(:,2:end),cie.lambda(:),interpMethod) Does any one have any pointers or have they done this before?Īlso, yes I know chromaticity diagrams should never be colored in beacsue our displays can't produce the full diagram, and etc. My issue is not in forming the spectral locus that I can do, right now I'm only using three points but I'm trying to color the diagram in. I'm trying to make a chromaticity diagram in tikZ, does anyone know how to make one?
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