information about tiff image

iminfo of my image gives

FormatSignature: [73 73 42 0]

Offset: 264322 what is an offset?h开发者_高级运维ow this value comes?

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It is the signature of a TIFF file. Matlab's way of saying "I endorse this file as TIFF".

Matlab detects the file type by itself, not from the extension. Change the extension to JPG or XYZ, you'll still open it as a TIFF file.

Edit: This is for PNG for example : 137 80 78 71 13 10 26 10 GIF: 71 73 70 56 57 97 16 0

You can also use an hex editor, open the file, grab the first 8 bytes and convert it from hex to decimal.