Opencv2 cvtColor() does not work

Question

I am using OpenCV2 on Ubuntu 12.04. I can successfully run image read-display codes. However I am not able to run codes with inbuilt functions eg. cvtColor()

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

#include <stdio.h>

int main(int argc, char *argv[])
{
    cv::Mat image = cv::imread("img.jpg");

    if( image.data == NULL )
    {
        printf( "file cannot be loaded\n");
        return 1;
    }

    cv::namedWindow("My");
    cv::imshow("My", image);

    cv::Mat result;
    cv::cvtColor(image, result, CV_BGR2Luv);

    cv::imwrite("outImg.jpg", result);

    cv::waitKey(0);

    return 0;
}

I am using Qt-creator for my OpenCV After compiling with --libs, --cflags I get following compiler error:

make: Entering directory `/home/swaroop/Work/ai-junkies/cuda/uc_davis/opencv2.x/OpenCV2Test'
g++ -g -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_WEBKIT -DQT_NO_DEBUG -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4 -I/usr/include/opencv -I. -o main.o main.cpp
main.cpp: In function 'int main(int, char**)':
main.cpp:22:29: error: 'CV_BGR2Luv' was not declared in this scope
main.cpp:22:39: error: 'cvtColor' was not declared in this scope

Please help me fix this.

Answer 1

cvtColor declared in opencv2/imgproc/imgproc.hpp

keep in mind it's #include not #import

#include <opencv2/imgproc/imgproc.hpp>

Answer 2

Alternatively, if you are testing things and not concerned with overdoing the includes, you can simply have one line:

#include <opencv2/opencv.hpp>

and it will include most opencv2 headers.