I have a problem with the Image Class - or in particular the way it stores data. I need to process some images (JPG and TIFFs mainly), but have come into a problem with TIFF images. The images are stored on disc as 16-bit TIFF images - so pixel values are in the range 0-65535. Now, when I used Image.FromFile() - it reads OK and says the pixelformat is 48bpp. BUT, the data (R,G and B values) still appear to be stored as bytes. So a pixel value of (1,1,1) in the image is actually (0,0,0) in memory. I am guessing it normalises the image as r = (r / 65535) * 255; g = (b / 65535) * 255; b = (b / 65535) * 255; I do not want this and need the actual 16 bit unsigned integer values - the values close to zero (which are now truncated to zero) are VERY important. Does anyone know of a way to get this data? Thanks Barry

I think you mean the Graphics.FromImage() method. The exception is thrown because your image contains an indexed pixel format, which is unsupported.

How do you mean combine? Simply concatenate images, or alpha blend two images?

Have you created a Graphics object from the image? This will effectively draw on the image, so any post-processing should also apply to the drawings.

If it is an unmanaged DLL, I don't think there is anyway to find out. If it is managed, you can always decompile it - using, for example, the .net reflector[^]

Here is an example. http://www.codeproject.com/useritems/showdirsize.asp Barry

Ok - sorry. For some reason I thought "\n" didn't work and had to be in a String.Format call. I can now take that of my code where I have multiple line labels!

Will String.Format not do it? Barry

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... sorry if this is a dumb question - but I am creating a new class library and need to use the Image class. The System.Drawing (and System.Drawing.Imaging etc) namespaces are not available and I guess this is because I have not selected a Windows Application. Is there an easy way to use these missing namespaces when creating a new class library? Thanks Barry

I had the same problem and used seperate threads for waiting on a connection, and sending and receiving data. This frees up the main thread so the UI doesn't appear to stop responding. This link - http://staff.develop.com/woodring/dotnet/#socketsamp[^] - posted in reply to an article gives a good example, which got me going. Barry

I am new to C# and .net so there may be a more elegant solution , but the you could do it is as follows; // assume IA is a rectangle that defines the area // of the image you want to crop to and the original // image is in origImage......... Bitmap bmp_cropped = new Bitmap(IA.width, IA.height); Graphics g = Graphics.FromImage(bmp_cropped); g.DrawImage(origImage, 0, 0, IA, GraphicsUnit.Pixel); Hope this is of use. Barry

Hi I was wondering if anyone has any idea how to solve the following (I am coming from a C background and trying to tackle this in C#). I have a TCP/IP client/server implemented. Everything that I have seen requires the data to be sent in a byte array (or as a single byte). I need to be able to send an Int32 (i.e. a 4-element byte array represenation of the integer) or a vector of double (or float) values. I haven't been able to find anything that will allow me to copy an integer/float into it's equivalent byte representation (for example the equivalent of memcpy in C). Any pointers would be greatly appreciated! Thanks Barry