chapster wrote in post #18556563
Kirkt If you can remember how to diff DNG files that would be great. As far as Lightroom goes how would I compare or look at the database ?
Just open the all images view and set order by date. I would probably filter for master copies, just to remove any virtual copies from view. Then all you have to do is scan the images visually for duplicates. If you know which folders the suspected duplicates are in then it is possible to select multiple folder locations, or even folder trees, if you have show sub folders enabled, simply by using Ctrl+Click. This then will reduce the number of images to be viewed to a minimum.
Since the edit instructions are held as text strings within the DNG file a simple binary diff tool will find any files with the same name and creation date that have differences. Of course with the DNG files initially what you really want to know is which files are identical binary copies, since getting rid of one of those will be a no brainer. Then you will need to compare the binary different files visually to see what the differences are. It may well be that the edits are the same, but the EXIF details are different, as this will also produce a binary difference in the file.
All of this presupposes you used either Lr, or worked using DNG files. If you used any other editing application working on native RAW formats then this won't show you any differences in edits between the different applications. Since this is still a Canon oriented forum one thing to note is that if you use DPP as your RAW editor that program, and that program alone, stores it's edits as metadata in the original CR2 file, just like with DNG files, not in a sidecar file.
Actually writing the edit information directly to the RAW file as metadata is a valid option for any RAW converter, since doing that won't actually change the image data of the file in any way. Each RAW editing program simply needs to create a new section within the "Private" area of the files metadata to store the information. As long as all programmers respect this you could have multiple edits from multiple programs, with all the data retained within the one file.