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Following up my previous question: if and how would it be possible to take RGB based TIFF files and convert them over to CMYK with standard .NET (3.5) functionality?

Is that possible at all?

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2 Answers 2

up vote 7 down vote accepted

Actually there is a way using the System.Windows.Media.Imaging namespace which only seems to work properly with TIFFs at the moment (which is fine for me):

    Stream imageStream = new
        FileStream(@"C:\temp\mike4.jpg", FileMode.Open, FileAccess.Read, FileShare.Read);
    BitmapSource myBitmapSource = BitmapFrame.Create(imageStream);
    FormatConvertedBitmap newFormatedBitmapSource = new FormatConvertedBitmap();
    newFormatedBitmapSource.Source = myBitmapSource;
    newFormatedBitmapSource.DestinationFormat = PixelFormats.Cmyk32;

    BitmapEncoder encoder = new TiffBitmapEncoder();

    Stream cmykStream = new FileStream(@"C:\temp\mike4_CMYK.tif",

    FileMode.Create, FileAccess.Write, FileShare.Write);

See "Converting images from RGB to CMYK", the answer by Calle Mellergardh.

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The link to Connect is a 404. –  bzlm Oct 12 '09 at 13:38

No, I don't think that's possible using standard GDI+ wrappers (System.Drawing). GDI+ only supports RGB. CMYK based images can be read by GDI+ (implicit conversion to RGB), but CMYK based images can't be written.

You might want to try something like GraphicsMill, which supports CMYK.

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