Convert JPEG-In-Tiff to normal TIff

I have a directory structure containing 300 gigs worth of Tiff Images. Some are encoded as Jpeg-in-Tiff, others as "Group 4 fax encoding". I need to change the format of all to the later without losing my folder structures.

A开发者_开发知识库nyone have any ideas?

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Pretty much any image viewer with a batch conversion shoudl do this I like irfanview