如何使用CImg库从jpg转换为bmp？

Question

I want to convert JPG to BMP file. I am using a library called CImg .
I am using the following code to do the conversion operation:

#include "CImg.h"  
using namespace cimg_library;

int main(int argc, char *argv[]) {

    CImg<unsigned char> image("picture.jpg");
    image.save_bmp("imgB.bmp");

    return 0;
}

But the following error occurs:

What might be the problem. Is there something I missed?

Answer 1

This problem happens because you have not installed ImageMagick .

Note that you must also have installed the ImageMagick package in order to be able to read JPG images.

If you are going to install ImageMagick into not standard path, then you will need to specify it's path like below

cimg::imagemagick_path("C:\\ImageMagick-6.9.2-Q16\\convert.exe");

If you don't want to install ImageMagick then you should link your code with libjpeg library and enable native JPG file support in CImg, putting this before including CImg.h:

#define cimg_use_jpeg
#include "CImg.h"

Using CImg with libjpeg is definitely better. That works the same for other image formats (tiff, png, ...).