EPS为所有类型的颜色格式返回CMYK结果

Question

我正在使用ImageMagick/ghostscript处理所有*.eps文件，并获得每个图像的颜色配置文件并显示结果。但我得到的结果与CMYK的灰度，RGB, CMYK相同。
我不知道我在哪里做错了，也不知道哪个属性会得到确切的结果。

c#代码

namespace ConsoleApplication3
{
    using System;
    using System.IO;
    using ImageMagick;
    class Program
    {
        static void Main(string[] args)
        {
            foreach (var epsFile in Directory.GetFiles(@"c:tmpeps", "*.eps"))
            {
                using (var image = new MagickImage())
                {
                    image.Read(epsFile);
                    Console.WriteLine("file: {0}   color space: {1}", epsFile, image.ColorSpace);
                }
            }
        }
    }
}

预期结果

file: c:tmpepsa.eps   color space: CMYK
file: c:tmpepsb.eps   color space: CMYK
file: c:tmpepsc.eps   color space: CMYK
file: c:tmpepscircle.eps   color space: sRGB
file: c:tmpepsd.eps   color space: CMYK
file: c:tmpepse.eps   color space: CMYK
file: c:tmpepsf.eps   color space: Grayscale
file: c:tmpepsfootball_logo.eps   color space: sRGB
file: c:tmpepsfsu_logo.eps   color space: sRGB
file: c:tmpepsg.eps   color space: CMYK
file: c:tmpepsicam_logo.eps   color space: sRGB
Press any key to continue . . .

但是当前的结果是

file: c:tmpepsa.eps   color space: CMYK
file: c:tmpepsb.eps   color space: CMYK
file: c:tmpepsc.eps   color space: CMYK
file: c:tmpepscircle.eps   color space: CMYK
file: c:tmpepsd.eps   color space: CMYK
file: c:tmpepse.eps   color space: CMYK
file: c:tmpepsf.eps   color space: CMYK
file: c:tmpepsfootball_logo.eps   color space: CMYK
file: c:tmpepsfsu_logo.eps   color space: CMYK
file: c:tmpepsg.eps   color space: CMYK
file: c:tmpepsicam_logo.eps   color space: CMYK
Press any key to continue . . .

Answer 1

一个简单的解决方案是重写用于设置颜色空间的PostScript操作符，如setgbcolor, setgray, setcmykcolor和setcolorspace。

,

/system_setrgbcolor /setrgbcolor load def
/setrgbcolor {
  (EPS file used setrgbcolor) == flush
  system_setrgbcolor
}bind def

或者更复杂的解决方案:

/MyDict 10 dict def
/MyDict begin
/UsedRGB false def
/UsedGray false def
/UsedCMYK false def
end
/system_setrgbcolor /setrgbcolor load def
/setrgbcolor {
  /MyDict /UsedRGB get not {
    (EPS file used setrgbcolor) == flush
    /MyDict /UsedRGB true put
  } if
  system_setrgbcolor
  end
}bind def

后者应该只打印颜色空间的第一次使用。

注意:此代码未经测试，可能包含错误。