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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.

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