Exif image data?

Question

I see that Tridion preserves an image's Exif details (e.g. example image). For example using WebDAV I can see the original Exif values on the left are still available on the right.

This works for loading images in the Content Manager Explorer, using Upload Multimedia, or by WebDAV.

These values are also kept when publishing the original image, though I notice copies lose this "metadata." For example, we have an "Image Resize" Template Building Block in training that creates a separate variant image that has its own (blank) Exif data.

Questions:

• Is there a way to programatically set these values on publish?
• Also, any thoughts on how Exif are handled with Contextual Image Delivery?

I'd imagine we'd do something with AddBinary() at least for publishing.

Answer 1

As EXIF data can only be defined for formats such as JPEG and TIFF - the I guess creating the variant we are putting it into a graphics 'object' as we resize - which is essentially converting the image to a regular bitmap so you'd lose the EXIF meta.

You could perhaps extract the EXIF data prior to resizing (perhaps put this in the image metadata) and then re-apply after the resize process.

Answer 2

Q: Is there a way to programatically set these values on publish?

A: Yes, but you need to do it either before the upload, or publish it as a variant using AddBinary() indeed. See https://stackoverflow.com/questions/226973/how-to-edit-exif-data-in-net for some details.

Q: any thoughts on how Exif are handled with Contextual Image Delivery?

A: I wouldn't know about that.