CImg: Failed to recognize the jpg format

Question

#include <iostream>
#include <stdlib.h>
#include "CImg.h"

using namespace cimg_library;
using namespace std;

int main(){
CImg<unsigned char> image("lena.jpg"), visu(500,400,1,3,0);

const unsigned char red[] = { 255,0,0 }, green[] = { 0,255,0 }, blue[] = { 0,0,255 };



return 0;}

When i compile this code the error: CImg::load(): Failed to recognize format of the file "lena.jpg" shows up.Any suggestion?

I installed the imageMagick but the error still happens.

Answer 1

To enable native JPG file support in CImg, put this before including CImg.h:

#define cimg_use_jpeg
#include "CImg.h"
....

and link your code with the libjpeg library. It works flawlessly for me. If you don't use this, CImg will try to do an external call to ImageMagick's convert tool to load the file, which is not the cleanest solution. Using libjpeg inside CImg is definitely better. That works the same for other image formats (tiff, png, ...).