Alex,
This is excellent.
Do you have any plans to advance it in the direction of writing EXIF data?
Plans ? No. Ideas ? Yes
Overall plan is - add some Makernote extraction - fix bugs - write the app that got me started on this path - fix bugs - think about modifying and/or writing Exif data.
I do intend to experiment a bit with writing the Exif data for a couple of specific purposes.
1. My favourite photo editor loses all Exif data (it's an old version of PicturePublisher). Newer version retain the Exif data, but they come in two versions - professional which is out of my price range, and consumer which lacks the feature that makes it my favourite :-)
So I'm thinking of simply copying all Exif data from one file into another one which doesn't already have any - might be simple though I need to figure out how much of the data becomes incorrect.
But at the same time, I'm using both GIMP and PS Elements, and getting used to them - so this need might disappear before I get to it.
2. My camera (Pentax *ist D) produces a 56K byte Makernote data section. Not an issue in my 2-3 Mbyte photos, but when I crop and compress it to put on the web, I can easily finish up with files that are 100K in size - with over 50% being "wasted".
3. Camera thumbnails. Many cameras embed a thumbnail in the JPEG they produce (they use it for the thumbnail view on -camera). It's typically never used again after the photo is uploaded, but can hang around indefinitely (more "wasted" space).
It would be generally easy to modify existing data (just overwrite the existing field), but trickier to add (or delete) data. Do you have any particular purpose in mind ? Any specific ideas for what you'd like to write ?
-- Alex.
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