Read and Display Image in OpenCV

Syntax:
C++: Mat imread(const string& filename, int flags=1 )

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Parameters:           
filename – Name of file to be loaded.
flags –Flags specifying the color type of a loaded image:-

CV_LOAD_IMAGE_ANYDEPTH - If set, return 16-bit/32-bit image when the input has the corresponding depth, otherwise convert it to 8-bit.
CV_LOAD_IMAGE_COLOR - If set, always convert image to the color one
CV_LOAD_IMAGE_GRAYSCALE - If set, always convert image to the grayscale one

>0 Return a 3-channel color image.
=0 Return a grayscale image.
<0 Return the loaded image as is (with alpha channel).

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//OpenCv C++ Example of Reading Image
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "iostream"
 
using namespace cv;
using namespace std;
 
int main( int argc, char** argv )
{
 Mat image1;
 
// Read the file
image1 = imread("C:\\Users\\arjun\\Desktop\\opencv-logo.jpg",CV_LOAD_IMAGE_COLOR);
// Check for invalid input
 if(! image1.data )                              
    {
        cout << "Could not open or find the image" << std::endl ;
        return -1;
    } 
 
//Dispay the Image in the window 
namedWindow("Image1");
 imshow("Image1",image1);

 waitKey(0);
}

Note the Location of the image is:
C:\Users\arjun\Desktop\a.jpg where "opencv-logo.jpg" .
( Here we append additional "\" after each file or folder name.)

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Image Formats supported by OpenCV:

Windows bitmaps	*.bmp, *.dib
JPEG files	*.jpeg, *.jpg, *.jpe
JPEG 2000 files	*.jp2
Portable Network Graphics	*.png
Portable image format	*.pbm, *.pgm, *.ppm
Sun rasters	*.sr, *.ras
TIFF files	*.tiff, *.tif