Linear Colorspace

Hey graphicsmagick-help,

I need your assistance! I'm trying to resize an image 
(http://www.4p8.com/eric.brasseur/gamma_dalai_lama_gray.jpg) using a 
linear colorspace. I can't seem to get GraphicsMagick to actually do the 
conversion. I'm probably making a really dumb mistake, but any input 
would be hugely appreciated. The code below seems to work with 
ImageMagick 6.9.2-7, but not with GraphicsMagick 1.3.23 (obviously 
change MagickCore to MagickLib.)

Here's my program:

#include <Magick++.h>
#include <vector>

using namespace Magick;

int main(int, char** argv)
{
      InitializeMagick(argv[0]);
      std::vector<Image> images;
      readImages(&images, "gamma_dalai_lama_gray.jpg");
      Geometry geom(129, 111);
      std::for_each(images.begin(), images.end(), [&geom] (Image& img) {
          img.quality(80);
          MagickCore::ImageInfo* info = img.imageInfo();
          MagickCore::CloneString(&info->sampling_factor, "1x1,1x1,1x1");
          img.colorSpace(ColorspaceType::RGBColorspace);
          img.scale(geom);
          img.colorSpace(ColorspaceType::sRGBColorspace);
      });
      writeImages(images.begin(), images.end(), 
"gamma_dalai_lama_gray_half.jpg");
}

Compile with: g++ main.cpp -std=c++11 `pkg-config --cflags --libs 
GraphicsMagick GraphicsMagick++` -Wall

Thanks,
Sam


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