To generate a matrix of RGB values, pass any one of these functions an integer that specifies the number of colors that are to be generated. You can run the MATLAB demo function imageext to look at a demonstration of the color maps. Pastel shades of pink – makes grayscale images look "sepia tone"Īlternating red, orange, yellow, green, blue, violet Uses the colors specified in the ColorOrder property of the axes object to generate a colormap Variant of hsv that is associated with an astrophysical fluid jet simulation from the National Center for Supercomputer Applications – this is MATLAB’s default color map Red, pass through yellow, green, cyan, blue, magenta, and return to red Regularly spaced colors with additional grays, red, green, and blue.Īlternating red, white, blue, and black, completely changing with each index increment The individual binary color representations are already associated with a name or a character string as shown in the following table. MATLAB comes with many predefined colors, many of which you have already used. Each component is an intensity value between zero and one, in a manner such that a zero is no intensity of the color, while a one turns on that component to full intensity. Each row in this matrix defines a particular color by specifying the contribution of red, green, and blue components. Generally speaking, a color map is simply a three-column matrix whose length is equal to the number of colors it defines. When we created some of our 3-dimensional surface plots we observed that the surface’s color varied with the height of the surface, and we also made the color a function of the rate of curvature of the surface.The next section is aimed at teaching you about the commands that relate to these two color specification techniques and how you can use them to control an object’s color. The table below lists the colors that MATLAB recognizes when you use a string to represent either their long or short names. MATLAB has a term for the three ways you can specify colors: it’s called ColorSpec and is either RGB triple, short name, or long name. We also saw that we can specify a color using relative contributions of red, green, and blue in what is called RGB format, so we could specify yellow for an axes background with set(gca, ‘Color’,). We also have seen that you don’t need to spell out the whole name of a property, so you could use short names for a color, or even a single letter, as long as it is unambiguous. For example, to specify a green color for the current figure’s background, we can set its color with set(gcf,’Color’,'green’). After we learned about object handles, we saw that we can alter the properties of any graphics object. For example, a red line can be created by simply typing plot(x,y,’red’). We saw that you could use the high-level commands to specify the color of the lines by passing string arguments that contained color names as we usually refer to them when talking with other people.
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