You can use ColorSpec anywhere you need to define a color. For example, if you have a color image in JPEG format, ‘image.jpg’, with size MxN then using AIMREAD(‘imag.jpg’,’JPG’) will create a MxNx3 matrix A, with A(1:M,1:N,1) storing the red component, A(1:M,1:N,2) the green component, and A(1:M,1:N,3) the blue component. These statements generate equivalent results: If the file contains a RGB color image, then A is a 3D matrix. They are referred to as fixed colors, as opposed to colormap colors.Įxamples To change the background color of a Figure to green, specify the color with a short name, a long name, or an RGB triple. Remarks The eight predefined colors and any colors you specify as RGB values are not part of a Figure's colormap, nor are they affected by changes to the Figure's colormap. The following table lists the predefined colors and their RGB equivalents. I was able to know also that you can pick a certain coordinates using your mouse to select the pixel you wanted to obtain the RGB Values. The RGB triple is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color the intensities must be in the range. The short names and long names are MATLAB strings that specify one of eight predefined colors. The output of label2rgb is of class uint8.ColorSpec (MATLAB Function Reference) MATLAB Function Referenceĭescription ColorSpec is not a command it refers to the three ways in which you specify color in MATLAB: It must contain finite, nonnegative integers. The columns of the output matrix, cmap, represent hue, saturation, and value, respectively. The input label matrix L can have any nonsparse, numeric class. The columns of the input matrix, M, represent intensities of red, green, and blue, respectively. If order is 'shuffle', label2rgb assigns colormap colors pseudo-randomly. If order is 'noshuffle' (the default), label2rgb assigns colormap colors to label matrix regions in numerical order. RGB = label2rgb(L,map,zerocolor,order) controls how label2rgb assigns colormap colors to regions in the label matrix. ![]() If you do not specify zerocolor, the default value for zero-labeled elements is (white). Many plotting functions have an input argument such as c or colorspecfor customizing the color. You can customize the colors if you need to. The default colors provide a clean and consistent look across the different plots you create. As the value of zerocolor, specify an RGB triple or one of the strings listed in this table. MATLAB® creates plots using a default set of colors. RGB = label2rgb(L,map,zerocolor) defines the RGB color of the elements labeled zero (i.e., the background) in the input label matrix L. Function handle of a colormap function, such as or you do not specify map, the default value is 'colorcube'.String containing the name of a MATLAB colormap function, such as 'jet' or 'gray' (See colormap for a list of supported colormaps.). ![]() The colormap, map, can have any of the following values: RGB = label2rgb(L,map) defines the colormap to be used in the RGB image. The label2rgb function picks colors from the entire range. The label2rgb function determines the color to assign to each object based on the number of objects in the label matrix and range of colors in the colormap. ![]() RGB = label2rgb(L) converts a label matrix L, such as those returned by bwlabel or watershed, into an RGB color image for the purpose of visualizing the labeled regions. Label2rgb (Image Processing Toolbox) Image Processing Toolbox
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