The guy who left his image-names the same but added the date as as prefix, that is the best fix I've read so far. I've considered that, the only thing is that it would seem to make the file-name rather long.
I shoot with a Nikon D50, same difference--it names its images DSC_xxxx.jpg.
Before I get into my system, I will mention one program I found handy for renaming--Explorer XP. (
http://www.explorerxp.com/ ) It's a freeware file-manager progam, and it has a rather powerful batch-renaming utility. It also has "tabbed file browsing," so you can have multiple file paths open simultaneously as separate "tabs" (like websites with Mozilla) and then easily drag-drop files by dragging from tab-to-tab.
Also, if you have Nikon View installed (I use it rather than Picture Project), it has a renaming tool built-in as well, although it's not as powerful.
Anyhow, I developed a system which may not be the best, I am always rethinking it, not sure if I could do it some way that's better, but here is how it runs currently:
I have a folder for each camera (in this case, Nikon D50), and underneath there are 3 folders--JPEG, RAW, and UNSORTED.
First-off, I download all photos by simply copying/pasting the "100NCD50" from the SD card into the "unsorted" folder so I can "clean them up" before I "integrate" them with the others. I will then rename this folder "100NCD50-1" (add the -1 part) so that if I download more later before I've "integrated" these with the others I can prevent "cross-contimation" of names (the next batch I'll rename 100NCD50-2, then 100NCD50-3, etc).
I immediately convert the files to lowercase names (websites seem to like lowercase names better, so I'm pre-emptively striking that potential problem).
I move the NEF files (if there are any) to an "NEF" folder within the "100NCD50" folder
I add the "nbj" suffix to JPEGs which were shot in RAW+BASIC mode (nbj standing for Nef + Basic Jpeg) so I can immediately recognize them as less than full-quality JPEGs and so I can easily see that there is a RAW file "original" of such shots
Later on, when I organize the "unsorted" shots:
I then create folders in the JPEG folder for those shots based on when they were shots. Pictures taken today, for example, would have a folder named 2006-07-26. I then move the JPEGs from the "100NCD50" folder within "unsorted" to this new folder
I do likewise for the RAW files. I then delete the empty folders under "unorganized."
The neat thing about Explorer XP is that you have "tabbed browsing" so I can have "unsorted" and "JPEG" and "RAW" open as separate tabs, and then just drap-drop real easily from one to the other.
The thing I don't like about my system is that:
With my first digital, a simple P/S back in 2003, I devised a system where the file was renamed totally, as yyyy_mm_dd_xxx.jpeg (and I still do this with my current "simple" P/S, Sony DSC-W1). I didn't do likewise when I got my first "serious," a Coolpix 5700 because (a) I still had the cheap P/S and I couldn't have duplicate filenames between the two cameras and (b) the JPEG and RAW files would not have matching names so you couldn't link them together.
I don't know that this solves your dilemma, except that since images are organized by JPEG and then by date-time there is no "cross contamination," unless you copy them to a "reprint" folder for having the lab process it and you happen to have the same 2 images there.
I hope I helped. Mainly, I hope someone reads my system and advised me how I could do better.
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LRH
http://www.pbase.com/larrytucaz
http://larrytxeast.smugmug.com/
Nikon Dee-50, click profile for more on gear