Transform a Gray Image to Pseudo-color Image

this function is based on pre-defined color maps in Matlab

function rgb = ImGray2Pseudocolor(gim, map, n)
% IMGRAY2PSEUDOCOLOR transform a gray image to pseudocolor image
% GIM is the input gray image data
% MAP is the colormap already defined in MATLAB, for example:
% 'Jet','HSV','Hot','Cool','Spring','Summer','Autumn','Winter','Gray',
% 'Bone','Copper','Pink','Lines'
% N specifies the size of the colormap
% rgb is the output COLOR image data
%