如何使用C＃识别CMYK图像 [英] How to identify CMYK images using C#

问题描述

有人知道如何使用C＃正确识别CMYK图像吗？我找到了使用ImageMagick的方法，但是我需要一个.NET解决方案。我在网上发现了3个代码段，其中只有一个在Windows 7中有效，但是在Windows Server 2008 SP2中都失败了。我至少在Windows Server 2008 SP2中需要它。这是我发现的东西：

Does anybody know how to properly identify CMYK images using C#? I found how to do it using ImageMagick, but I need a .NET solution. I found 3 code snippets online, only one works in Windows 7, but all fail in Windows Server 2008 SP2. I need it to work at least in Windows Server 2008 SP2. Here is what I've found:

    using System.Windows.Media;
    using System.Windows.Media.Imaging;
    using System.Drawing;
    using System.Drawing.Imaging;

    bool isCmyk;

    // WPF
    BitmapImage wpfImage = new BitmapImage(new Uri(imgFile));

    // false in Win7 & WinServer08, wpfImage.Format = Bgr32
    isCmyk = (wpfImage.Format == PixelFormats.Cmyk32);

    // Using GDI+
    Image img = Image.FromFile(file);

    // false in Win7 & WinServer08
    isCmyk = ((((ImageFlags)img.Flags) & ImageFlags.ColorSpaceCmyk) == 
        ImageFlags.ColorSpaceCmyk); 

    // true in Win7, false in WinServer08 (img.PixelFormat = Format24bppRgb) 
    isCmyk = ((int)img.PixelFormat) == 8207; 

推荐答案

我不会以BitmapImage开头加载数据。实际上，我根本不会使用它。相反，我会使用 BitmapDecoder :: Create 并传入 BitmapCreateOptions.PreservePixelFormat 。然后，您可以访问感兴趣的 BitmapFrame 并检查其 Format 属性，现在应产生CMYK。

I wouldn't start with BitmapImage as your way of loading the data. In fact, I wouldn't use it at all for this. Instead I would use BitmapDecoder::Create and pass in BitmapCreateOptions.PreservePixelFormat. Then you can access the BitmapFrame you're interested in and check its Format property which should now yield CMYK.

然后，如果您确实需要显示图像，则只需分配 BitmapFrame ，它也是一个 BitmapSource 子类，将其转换为 Image :: Source 。

Then, if you really need to display the image, you can just assign the BitmapFrame, which is also a BitmapSource subclass, to an Image::Source.

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