DM3
From Just Solve the File Format Problem
DM3 is an image format used by Digital Micrograph, a program used in transmission electron microscopy, often in order to interface with the hardware made by the company that releases it (Gatan). It contains a large amount of metadata in addition to the image itself. It succeeded DM2 and was succeeded by DM4.
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Identification
DM3 files have the extension ".dm3", the type code "GTGI", and the creator code "GCCD"[2]. Their contents start with the version number big-endian, i.e. 00 00 00 03.[2]
