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copied!<p>None of the examples above create 8-bit (8bpp) bitmap images. Some software, such as image processing, only supports 8bpp. Unfortunately the MS .NET libraries do not have a solution. The <a href="http://msdn.microsoft.com/en-us/library/system.drawing.imaging.pixelformat.aspx" rel="nofollow noreferrer">PixelFormat.Format8bppIndexed</a> format looks promising but after a lot of attempts I couldn't get it working. </p> <p>To create a true 8-bit bitmap file you need to create the <a href="http://en.wikipedia.org/wiki/BMP_file_format" rel="nofollow noreferrer">proper headers</a>. Ultimately I found the <a href="http://www.codeproject.com/KB/recipes/GrayScale.aspx" rel="nofollow noreferrer">Grayscale library</a> solution for creating 8-bit bitmap (BMP) files. The code is very simple:</p> <pre><code>Image image = Image.FromFile("c:/path/to/image.jpg"); GrayBMP_File.CreateGrayBitmapFile(image, "c:/path/to/8bpp/image.bmp"); </code></pre> <p>The code for this project is far from pretty but it works, with one little simple-to-fix problem. The author hard-coded the image resolution to 10x10. Image processing programs do not like this. The fix is open GrayBMP_File.cs (yeah, funky file naming, I know) and replace lines 50 and 51 with the code below. The example sets the resolution to 200x200 but you should change it to the proper number. </p> <pre><code>int resX = 200; int resY = 200; // horizontal resolution Copy_to_Index(DIB_header, BitConverter.GetBytes(resX * 100), 24); // vertical resolution Copy_to_Index(DIB_header, BitConverter.GetBytes(resY * 100), 28); </code></pre>

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