Auto renaming auto exposure bracketed files in DNG converter
- December 30, 2025
- 1 reply
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I use various Canon EOS cameras ranging from my trusty 5D mk3, an M6 mk2 and a recently purchased R5 mk2. I always shoot in RAW (well at least 99.99999% of the time) and the RAW files come with the .cr2 and .cr3 extensions. Once I've looked at all of the images using the Canon Digital Phot Professional sofware and culled/deleted unwanted images I would then normally use DNG converter and then delete the original .cr2 and .cr3 files. When I've been shooting single shots I also utilise the renaming function within DNG converter and they would be changed from something like IMG4085.cr3, IMG4086.cr3, IMG4087.cr3 etc to more meaningful file names like R52_271225-001, R52_271225-002, R52_271225-003 and so on denoting I used a Canon R5 mk2 (R52), they were shot on the 27th December 2025 (271225) and followed by a sequence number -001, -002, -003 etc. I use 5D3 for the 5D mk3 and M62 for the M6 mk2.
The issue arises when I shoot bracketed images of a subject or landscape to capture a wider dynamic range. I normally shoot 3 shot AEB, sometimes 5 shot but only for difficult subjects and I tend to set my bracketing anywhere from ± 1⅔ to ±2 EV and then I have to manually identify them and rename them something like R52_271225-001-0, R52_271225-001-1.66 and R52_271225-001+1.66 for example so I know and can keep a particular set of bracketed images together or in a stack in Lightroom for example. The trouble is you can't do this in DNG converter as it only does straight conversions from one name to another so I tend to rename in the Canon software so that I've got the file names I want with the .cr2 or .cr3 extensions and then I run them through DNG converter without choosing a renaming function, just a straight file to file conversion.
DNG converter strips various things from the original Canon files but in Lightroom and Photoshop I can see the original shooting information including the AEB info in the relative AEB images. I was thinking that it would be a reasonable update to improve DNG converter where it could easily recongnise an AEB sequence of images whilst doing a native file to dng conversion but when it came acorss them it would apply the same sequence number to all 3 AEB images if you've shot 3 or 5 if you've shot 5 etc and then append each of these files with something more relevant. In my case this would be -0, -1.66 and +1.66 ( for a ± 1⅔ AEB sequence). This would cut down on the manual time it takes to do it and more importantly the human error/mistakes.
Once I've got my files renamed to how I like to store them I place them in a folder on a backed up external SSD in country, area, location, year, month and day format. My folders look something like E:\Drive #1\Images\England\North West\Local Area\2025\12 Dec\27th for the examples above and then I import them into Lightroom and keyword every file. From this point I merge each AEB set of images to produce an HDR version and I then work on it to produce my images. I looks like a longwinded and time consuming method but its not too bad and I'm used to it but I'd like it to be much easier. I'm pretty sure all files from all manufacturers would benefit from this. Hopefully I've not confused anyone and sent you all to sleep. This just the current way I do things and I'm not aware of any software or programs that can do multiple sets of AEB sequences which can be very tedious to rename at times.
Do any of you share this dilemma or something similar? My naming and file storage conventions derive from my many years in the aerospace engineering environment and the way in which we used to save CAD and CNC files etc. so I use something similar as its logical to me.
