问题
To load image, I installed the CImg library in my mac(OSX 10.10). Luckily I managed to display the bmp picture, but I failed to load and display other formats like png or jpg. Then I installed the ImageMagic which is downloaded from http://cactuslab.com/imagemagick/ and then run the program. The errors are still there.
My code is :
#include "CImg.h"
#include <stdlib.h>
#define cimg_use_magick
using namespace cimg_library;
int main() {
CImg<unsigned char> image("lena.jpg");
image.display();
return 0;
}
The program can be built successfully in my Xcode but it reported the error that is "failed to recognize the format" I just don't know how to fix it. thanks for your help!
回答1:
I am guessing your ImageMagick installation does not have the necessary libraries for reading JPEG files. ImageMagick refers to the handlers for the various image formats as DELEGATES, so try this command to see what formats your ImageMagick installation can cope with:
identify -list configure | grep DELEGATES
DELEGATES bzlib mpeg freetype jng jpeg lzma png tiff xml zlib
Personally, I never had any success with the CactusLabs installation. I use homebrew. You copy the one-liner installation script from here, and then you can simply manage all packages on your Mac with the brew command. For example, to find the name of the ImageMagick package, just do
brew search imagemagick
To install ImageMagick, run
brew install imagemagick
To uninstall ImageMagick, run
brew rm imagemagick
To install Cimg, run
brew install cimg
To find ffmpeg, or GNU Parallel, just do
brew search ffmpeg
brew search parallel
To sort out any problems with homebrew, just call the Doctor:
brew doctor
and it will tell you about any problems or inconsistencies.
来源：https://stackoverflow.com/questions/30458645/cimg-failed-to-recognize-the-format-jpeg