CODEWITHSUNDEEP
c#arraysbitmap
Mike
Mike

Reputation: 13

Get bitmap byte array without header c#

I have image with dimensions 98 x 102. Size on disc 11 270 bytes. I need to get byte array from this image without service information. I tried to do next:

     Bitmap bmp = new Bitmap(path);
     MemoryStream ms = new MemoryStream();
     bmp.Save(ms, ImageFormat.Bmp);
     byte[] result = ms.ToArray();

By this way i get array with image header, because length of get array is 11 270.

Is correctly that header size = 11270 - (98 * 102)? Because this result is 1274.

I'm trying to do this in console app.

If it is not correct, how i can do this?

Upvotes: 1

Views: 2596

Answers (1)

keith
keith

Reputation: 5342

I'm assuming you need to get the RGB data from this bitmap. You can do this by locking/unlocking the data in the bitmap to obtain access to the raw data. Example code from MSDN https://msdn.microsoft.com/en-us/library/5ey6h79d(v=vs.110).aspx:

        // Create bitmap.
        Bitmap bmp = new Bitmap("c:\\photo.jpg");

        // Lock the bitmap's bits.  
        Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
        System.Drawing.Imaging.BitmapData bmpData =
            bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
            bmp.PixelFormat);

        // Get the address of the first line.
        IntPtr ptr = bmpData.Scan0;

        // Declare an array to hold the bytes of the bitmap.
        int bytes  = Math.Abs(bmpData.Stride) * bmp.Height;
        byte[] rgbValues = new byte[bytes];

        // Copy the RGB values into the array.
        System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);

        // Set every third value to 255. A 24bpp bitmap will look red.  
        for (int counter = 2; counter < rgbValues.Length; counter += 3)
            rgbValues[counter] = 255;

        // Copy the RGB values back to the bitmap
        System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes);

        // Unlock the bits.
        bmp.UnlockBits(bmpData);

Upvotes: 2

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