thank you for your reply!
Well, I’ve just made a simple operation to show you an example.
- opened in Fiji a TIFF image (obtained from a RAW developed with Adobe Lightroom),
- exported the Exif in CSV format (in Fiji File > Import > Exif data…),
- saved the image in TIFF format without performing any processing,
- exported the Exif again.
Here I attach the screenshots of the metadata before and after saving the image.
As you can see, ImageJ retains only some metadata on the image resolution, bit depth, and few other information. Third party software for photogrammetry (e.g. Photoscan) and image stitching (e.g. PTGui) strongly rely on metadata like focal length, lens and camera model etc. Without the metadata embedded in the images, these information must be added manually, with consequent loss of accuracy.
In any case, the value of an image – that is not computer-generated – relies also on the completeness of the technical metadata, and this loss is, in my opinion, unacceptable in a scientific context.