Bitmap bmp = new Bitmap(allow_fileStream);  //文件路径

  allowUpload = stringHelper.IsCMYK(bmp) == "true" ? false : true;  //返回true字符串则图片不是RGB模式的

    public string IsCMYK(System.Drawing.Image img)
    {
        string isCmyk;
        if ((GetImageFlags(img).IndexOf("Ycck") > -1) || (GetImageFlags(img).IndexOf("Cmyk") > -1))
        {
            isCmyk = "true";
        }
        else
        {
            isCmyk = "false";
        }

        return isCmyk;
    }
    public string GetImageFlags(System.Drawing.Image img)
    {
        ImageFlags FlagVals = (ImageFlags)Enum.Parse(typeof(ImageFlags), img.Flags.ToString());
        return FlagVals.ToString();
    }

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