Red-green-blue to hue-saturation-value conversion.
H = RGB2HSV(M) converts an RGB color map to an HSV color map.
Each map is a matrix with any number of rows, exactly three columns,
and elements in the interval 0 to 1. The columns of the input matrix,
M, represent intensity of red, blue and green, respectively. The
columns of the resulting output matrix, H, represent hue, saturation
and color value, respectively.
See also HSV2RGB , COLORMAP , RGBPLOT .