A tip for windows users :
Exif data can be viewed/edited via the details tab of the file's properties.
In explorer ( that is windows explorer NOT internet explorer ) right click on the file and choose properties (at bottom of context menu).
To change metadata for a group of files (e.g. set the author and subject) just select them all in explorer and right click, choose properties, open details tab and change the fields, click apply and then click OK.
Another tip :
changing a file's metadata also alters its crc so if a picture upload is refused by a file host just alter the metadata and re-upload. No need to recompress the image.
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