I already replied to your email:

Interesting, thanks for the link. I didn't know that Flickr displayed makernote information. From looking at this, it is clear to me that Flickr used ExifTool as a source when developing their software because many of the tag names they use are ones that I created for information I decoded myself. But they have made a number of omissions in the value conversions, and haven't applied proper scaling to convert the values into usable units.

So yes, exiftool can display all this information in the same order, but the values won't all be the same because exiftool converts them properly.

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In your forum post you also ask how flickr is getting and splitting data from the photos. They have apparently been selective about the information they extract, because there is a lot of information that they are not decoding. So I would assume that they have written code similar to exiftool for parsing the makernote structure in the images, but haven't included tags that they feel are not very useful.

- Phil

The answer depends on how many different camera models you use. You could easily hand-pick a set of interesting tags if you only have a few different models. Otherwise, it will be harder to decide which makernote information to include. The IFD0/ExifIFD information is basic, and doesn't include interesting things like the camera serial number, lens model, focus distance, and sometimes even ISO which may exist in the makernote information.

I suggest defining a shortcut tag to represent all of the tags you are interested in. There are already pre-defined "Canon", "Canon20D" and "Nikon" shortcuts that may be a good starting point. See the config file documentation for an example of how to create user-defined shortcut tags.

- Phil

If you write a Perl script and call the ExifTool functions via the API, you can access the tag in an associative array like this. See the API documentation for details and coding examples.

- Phil