ApplyColorMap for pseudocoloring

// ApplyColorMap for pseudocoloring
// using OpenCV 3.0 Version
 
#include <cv.hpp>
 
using namespace cv;
using namespace std;
 
string colormap_name(int id)
{
    switch (id){
    case COLORMAP_AUTUMN:
        return "COLORMAP_AUTUMN";
    case COLORMAP_BONE:
        return "COLORMAP_BONE";
    case COLORMAP_JET:
        return "COLORMAP_JET";
    case COLORMAP_WINTER:
        return "COLORMAP_WINTER";
    case COLORMAP_RAINBOW:
        return "COLORMAP_RAINBOW";
    case COLORMAP_OCEAN:
        return "COLORMAP_OCEAN";
    case COLORMAP_SUMMER:
        return "COLORMAP_SUMMER";
    case COLORMAP_SPRING:
        return "COLORMAP_SPRING";
    case COLORMAP_COOL:
        return "COLORMAP_COOL";
    case COLORMAP_HSV:
        return "COLORMAP_HSV";
    case COLORMAP_PINK:
        return "COLORMAP_PINK";
    case COLORMAP_HOT:
        return "COLORMAP_HOT";
    }
 
    return "NONE";
}
 
int main()
{
    Mat im = imread("img/pluto.jpg", IMREAD_GRAYSCALE);
 
    Mat im_out = Mat::zeros(600, 800, CV_8UC3);
 
    for (int i = 0; i < 4; i++){
        for (int j = 0; j < 3; j++){
            int k = i + j * 4;
            Mat im_color = im_out(Rect(i * 200, j * 200, 200, 200));
            applyColorMap(im, im_color, k);
            putText(im_color, colormap_name(k), Point(30, 180), 
                CV_FONT_HERSHEY_DUPLEX, 0.5, Scalar::all(255), 1, CV_AA);
        }
    }
 
    imshow("Pseudo Colored", im_out);
    imwrite("img/Pseudo COlored.jpg", im_out);
    waitKey(0);
    
    return 0;
}