How to use colormap

Colormap is mainly used in MATLAB to change the color display of graphics. Its usage is as follows:

1. colormap(MAP) uses the MAP matrix to map the color map of the current graphic.

2. colormap('default') The default setting is JET.

3. MAP = colormap gets the current colormap matrix.

4. colormap(AX,...) applies the colormap to the graphic corresponding to the AX coordinates, not the current graphic.

In addition, the input of colormap is a matrix (n*3) containing arbitrary rows but only three columns. The colors in the matrix are numbers between 0-1, and each Three numbers in a row will be mapped to a color. The three values ​​correspond to the intensity of the three color channels of R (red), G (green), and B (blue). By changing the intensity of the three channel values, All the colors we need can be mapped. For example, (0,0,0) is mapped to black and (1,1,1) is mapped to white.

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