Is it a Bitmap or MetaFile?

Given a Stream that I know will be a picture, is there a way to program开发者_JS百科matically determine if it is a Bitmap or a MetaFile when pulled from Image.FromStream(mystream)? Like a flag or something.

Environment: .NET, System.Drawing, C#/VB

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Image.RawFormat

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I think, by reading the first few bytes one sould be able to identify. LIke II* are the byes in tiff file. ‰PNGin png, BM in bmp files