MDI

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File Format
Name MDI
Ontology
Extension(s) .mdi
MIME Type(s) image/vnd.ms-modi
PRONOM fmt/881

MDI is a proprietary image format used by Microsoft Office Document Imaging.

It is almost identical to TIFF, but has a different header, and may use one of several undocumented compression schemes.

Identification

Files begin with bytes 45 50 2a 00.

Compression

The compression schemes are reportedly defined as follows:

Code Compression scheme
34718 Binary Level Codec (BLC)
34719 Progressive Transform Codec (PTC)
34720 Vector

Other sources give the following, but 34719 and 34720 may have been accidentally swapped.

Code Compression scheme
34718 MODI_BLC
34719 MODI_VECTOR
34720 MODI_PTC

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