CODEWITHSUNDEEP
c++cimg
Peter
Peter

Reputation: 2260

cimg wont load lenna image

I'm using vs2015, created a win32 c++ console app This gives a pure native c++ app, while i got some other examples working. This demo code doesn't work, the problem seams to the loading of the lenna.png or lenna.jpg

Each time i get errors that the image file isn't recognized. ( i even used the original lenna as from wikipedia) but it doesn't work for some unknown reason, to exclude path problems i even placed lenna at "d:\\lenna.jpg" as well.

I don't know why it won't work, any ideas?

Is cimg just old and doesn't recognize jpg of these days ??

#include "CImg.h"
#include "stdafx.h"
using namespace cimg_library;

int main() {
 CImg<unsigned char> image("D:\\CODE\\Cimg-prj\\PGT\\Debug\\Lenna.png"), visu(500,400,1,3,0);
 const unsigned char red[] = { 255,0,0 }, green[] = { 0,255,0 }, blue[] = { 0,0,255 };
 image.blur(2.5);
 CImgDisplay main_disp(image,"Click a point"), draw_disp(visu,"Intensity profile");
 while (!main_disp.is_closed() && !draw_disp.is_closed()) {
  main_disp.wait();
  if (main_disp.button() && main_disp.mouse_y()>=0) {
   const int y = main_disp.mouse_y();
   visu.fill(0).draw_graph(image.get_crop(0,y,0,0,image.width()-1,y,0,0),red,1,1,0,255,0);
   visu.draw_graph(image.get_crop(0,y,0,1,image.width()-1,y,0,1),green,1,1,0,255,0);
   visu.draw_graph(image.get_crop(0,y,0,2,image.width()-1,y,0,2),blue,1,1,0,255,0).display(draw_disp);
  }
 }
return 0;
}

The errors i get (all output) :

Invalid Parameter - "C:\\Users\\Peter\\AppData\\Local\\Temp\\kY6GW46A.pnm"
'gm.exe' is not recognized as an internal or external command,
operable program or batch file.
Invalid Parameter - "C:\\Users\\Peter\\AppData\\Local\\Temp\\as88yC80.pnm"
'gm.exe' is not recognized as an internal or external command,
operable program or batch file.
Invalid Parameter - "C:\\Users\\Peter\\AppData\\Local\\Temp\\wa804U6G.pnm"
'gm.exe' is not recognized as an internal or external command,
operable program or batch file.

[CImg] * * * CImgIOException * * * [instance(0,0,0,0,00000000,non-shared)] CImg<float>::load(): Failed to recognize format of file 'Lenna.png'.

I am sure Lenna.png is a valid png file (if i rename its extension irfranview will try to rename it back as png).

I might not get it to work due to the extra complexity of setting up a project properly for png, i downloaded zlib and libpng, but not sure how to add them to the project (and their a bunch of files?, their not a single dll or .h file like cimg do i need to add all those files ???)

Upvotes: -2

Views: 507

Answers (1)

Mark Setchell
Mark Setchell

Reputation: 207485

If you want CImg to be able to load PNG files without relying on ImageMagick, you must tell it so by defining a macro before loading the CImg header file;

#define cimg_use_png 1
#include "CImg.h"

You must also link with library GDI32 and libpng and libz for compression of PNGs.

Upvotes: 0

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