用opencv和png ++在c ++中处理png

Question

Here is link for png++ : http://savannah.nongnu.org/projects/pngpp/

What I'm doing wrong? I installed opencv for OS X by command in terminal:"brew install opencv" and I have problems with using library png++.

#include <iostream>
#include "png++/png.hpp"

using namespace std;
int main(int argc, const char * argv[]) 
{
  png::image< png::rgb_pixel > image("74");
  for(int i=0;i<image.get_width();i++)
  {
    for(int j=0;j<image.get_height();j++)
    {
        image[i][j]=png::rgb_pixel(255-image[i][j].red, 255-image[i][j].green, 255-image[i][j].blue);
    }
}
image.write("output.png");
return 0;
}

And I have next errors:

error messages

Answer 1

Problem was, that I install opencv with brew, which I installed on Yosemite. When I updated brew on ElCapitan and reinstalled opencv, errors disappeared.