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POHow to identify CMYK images in ASP.NET using C#
 

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  1. POHow to identify CMYK images in ASP.NET using C#
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    <p>Does anybody know how to properly identify CMYK images in ASP.NET using C#? When I check the <code>Flags</code> attribute of a <code>Bitmap</code> instance, I get incorrect results.</p> <p>I have created three images to test this: cmyk.jpg, rgb.jpg and gray.jpg. These are respectively CMYK, RGB and Grayscale images.</p> <p>This is my test code:</p> <pre><code>static void Main(string[] args) { Bitmap bmpCMYK = new Bitmap("cmyk.jpg"); Bitmap bmpRGB = new Bitmap("rgb.jpg"); Bitmap bmpGray = new Bitmap("gray.jpg"); Console.WriteLine("\t\tRgb\tCmyk\tGray\tYcbcr\tYcck\tPixelFormat"); Console.WriteLine("cmyk.jpg\t{0}\t{1}\t{2}\t{3}\t{4}\t{5}", IsSet(bmpCMYK, System.Drawing.Imaging.ImageFlags.ColorSpaceRgb), IsSet(bmpCMYK, System.Drawing.Imaging.ImageFlags.ColorSpaceCmyk), IsSet(bmpCMYK, System.Drawing.Imaging.ImageFlags.ColorSpaceGray), IsSet(bmpCMYK, System.Drawing.Imaging.ImageFlags.ColorSpaceYcbcr), IsSet(bmpCMYK, System.Drawing.Imaging.ImageFlags.ColorSpaceYcck), bmpCMYK.PixelFormat); Console.WriteLine("rgb.jpg\t\t{0}\t{1}\t{2}\t{3}\t{4}\t{5}", IsSet(bmpRGB, System.Drawing.Imaging.ImageFlags.ColorSpaceRgb), IsSet(bmpRGB, System.Drawing.Imaging.ImageFlags.ColorSpaceCmyk), IsSet(bmpRGB, System.Drawing.Imaging.ImageFlags.ColorSpaceGray), IsSet(bmpRGB, System.Drawing.Imaging.ImageFlags.ColorSpaceYcbcr), IsSet(bmpRGB, System.Drawing.Imaging.ImageFlags.ColorSpaceYcck), bmpRGB.PixelFormat); Console.WriteLine("gray.jpg\t{0}\t{1}\t{2}\t{3}\t{4}\t{5}", IsSet(bmpGray, System.Drawing.Imaging.ImageFlags.ColorSpaceRgb), IsSet(bmpGray, System.Drawing.Imaging.ImageFlags.ColorSpaceCmyk), IsSet(bmpGray, System.Drawing.Imaging.ImageFlags.ColorSpaceGray), IsSet(bmpGray, System.Drawing.Imaging.ImageFlags.ColorSpaceYcbcr), IsSet(bmpGray, System.Drawing.Imaging.ImageFlags.ColorSpaceYcck), bmpGray.PixelFormat); bmpCMYK.Dispose(); bmpRGB.Dispose(); bmpGray.Dispose(); Console.ReadLine(); } private static bool IsSet(Bitmap bitmap, System.Drawing.Imaging.ImageFlags flag) { return (bitmap.Flags &amp; (int)flag) == (int)flag; } </code></pre> <p>This produces the following output: <img src="https://i.stack.imgur.com/fdBL5.gif" alt="Test results"></p> <p>I have checked the actual images and cmyk.jpg really <em>is</em> a CMYK image.</p> <p>Apparently, this is a "known issue". Alex Gil had the same problem in WPF (see this question: <a href="https://stackoverflow.com/questions/4315335/how-to-identify-cmyk-images-using-c">How to identify CMYK images using C#</a>) and he managed to solve it by using a <code>BitmapDecoder</code> class to load the images. I'm a bit uncomfortable using that solution in ASP.NET because it requires me to add references to WindowsBase.dll and PresentationCore.dll and I'm not sure I want those in a web project.</p> <p>Does anyone know of any other pure .NET solutions to check if an image is in the CMYK format that I can safely use in ASP.NET?</p>
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