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Use of built-in colormaps:
MATLAB has built-in colormaps, it is also possible to generate others by using combinations of any colors. For illustration, the following generates a customized colormap with only three colors: black, white, & red. This is then set to be the present colormap by passing the color map matrix to the colormap function. Then, a 40× 40 matrix of arbitrary integers in the range from 1 to 3 (as there are just 3 colors) is generated, and that is passed to the image function; the results are as shown in figure:
>> mycolormap = [0 0 0; 1 1 1; 1 0 0]
mycolormap =
0 0 0
1 1 1
1 0 0
>> colormap(mycolormap)
>> mat = randint(40,40,[1 3]);
>> image(mat)
Example of image processing: The other illustration generates a 5 × 5 matrix of arbitrary integers in the range from 1 to the number of colors; the resultant image is as shown
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Illustration of Image processing: This displays that there are 64 rows, or in another word, 64 colors, in this specific colormap. It also displays that the first five colors a
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