Read BITMAPINFOHEADER and get width and height of the image


i wrote some code :

            FileStream fs = File.OpenRead(@"c:\Zapotec.bmp");
            BinaryReader breader = new BinaryReader(fs);
            Int32 width = breader.ReadInt32();
            Int32 height = breader.ReadInt32();
            Int16 biBitCount = breader.ReadInt16();


but i am getting very large number in width  and in height
please help me to get the right size.
becouse if i am loading this image for example:
Bitmap bmp = new Bitmap(@"c:\Zapotec.bmp");
bmp.width  and bmp.height  much smoller.

please help me
i need only this 2 parameters and we are working with very big images so we can't load image we need only to get this 2 parameters.


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Suggest setting your first seek to 18, instead of 16.

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Bob LearnedCommented:
Is there a reason that you are doing it that way, instead of this way:

Bitmap bmp = new Bitmap(@"c:\windows\zapotec.bmp");
int height = bmp.Height;
int width = bmp.Width;

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