To further illustrate the concept of the three separate color planes used in an RGB image, the code sample below creates a simple RGB image containing uninterrupted areas of red, green, and blue, and then creates one image for each of its separate color planes (red, green, and blue). To determine the color of the pixel at (2,3), you would look at the RGB triplet stored in (2,3,1:3). For example, the red, green, and blue color components of the pixel (10,5) are stored in RGB(10,5,1), RGB(10,5,2), and RGB(10,5,3), respectively.įigure 2-4 depicts an RGB image of class double.įigure 2-4: The Color Planes of an RGB Image
The three color components for each pixel are stored along the third dimension of the data array. A pixel whose color components are (0,0,0) displays as black, and a pixel whose color components are (1,1,1) displays as white. In an RGB array of class double, each color component is a value between 0 and 1. The precision with which a real-life image can be replicated has led to the commonly used term truecolor image.Īn RGB MATLAB array can be of class double, uint8, or uint16.
This yields a potential of 16 million colors. Graphics file formats store RGB images as 24-bit images, where the red, green, and blue components are 8 bits each. The color of each pixel is determined by the combination of the red, green, and blue intensities stored in each color plane at the pixel's location. The output of label2rgb is of class uint8.Introduction (Image Processing Toolbox) Image Processing ToolboxĪn RGB image, sometimes referred to as a truecolor image, is stored in MATLAB as an m-by-n-by-3 data array that defines red, green, and blue color components for each individual pixel. It must contain finite, nonnegative integers. The input label matrix L can have any nonsparse, numeric class. 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). As the value of zerocolor, specify an RGB triple or one of the strings listed in this table. 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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