According to my /usr/share/magic, the headers differ for the two, "II\x2A\x00" for little-endian (Intel), and "MM\x00\x2A" for big-endian (Motorola).

Update: You have more against you than the header. TIFF files are tagged data, and part of the tag should not be reordered. Will follow up with specifics.

Update: The TIFF header looks like this C struct, 

typedef struct {
    uint16    numbertype;
    uint16    version;
    uint32    offset;
} TIFFHEAD;

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'offset' is the offset to the first tagged image library in the file. The tag is a structure like this: 
typedef struct {
    uint16    tag;
    uint16    type;
    uint32    length;
    uint32    offset;
} TIFFTAG;

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Tags can nest. The data they contain is a mixture of types. A straightforward 32-bit conversion like you propose will clearly scramble the file. You need to get information about TIFF tag types and recursively unpack the files according to each tag's content.

After Compline,
Zaxo

In reply to Re: How to flip little-endian TIFF to big-endian? by Zaxo
in thread How to flip little-endian TIFF to big-endian? by Anonymous Monk

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