Ok, so normally I use Irfanview to batch rename or convert stuff, but I've hit a snag; it won't allow me to specify a completely randomly generated string for the new filenames (either random or a hash of the image like you'd get on uploaded image here).

So does anyone happen to know of a batch program that can do that? I've been searching around the place but nothing I've so far found has had the ability to rename images randomly or based on hash. I'm hoping someone here knows of something that does :)

So incrementally renamed files won't work for you? Why on earth do you want random file names?

Well, rather than random I'd prefer hash-based, but random will have to suffice if that's not possible. I keep stuff in various folders (bikinis, nudes, underwear etc etc) for neatness, but I occasionally have a total overhaul of the system when it gets a bit messy (which it always does, I'm not always brilliant at keeping things in the right folders heh).
Trouble is, I often batch rename stuff as well, and sometimes end up with a system where tons of files have the same filenames, only in different folders. That makes things difficult when I come to re-organize again, so I want to rename everything using hashes so they're all guaranteed to be unique :)
Obviously stuff saved directly from imageboards isn't generally an issue since those are often hashed filenames anyway, but going through thousands and thousands of images manually to sort out those filenames that aren't a problem isn't something I feel inclined to do :p

Radiosity do you want to rename only files that have same name or probably simpler solution would be just add a number to name of files (i.e. foo => 1_foo... etc.) if that solution would work for you, I think I could write java program that would do it for you even with my limited knowledge of java or somebody else on imouto who can programming could do it.

http://img366.imageshack.us/img366/3865/clipboard1.png
won't this way work?

i selfprogged my own fully functional md5 hash-tag rename java software, so if you can prog a bit, just make your own! ;)

only downside: you need a recent md5-tag.txt for it

MDGeist, I remember you posted the code for me for generating md5s:
http://moe.imouto.org/forum/show/741

Thanks for the replies guys, got it working in a different way now. Looking through irfanviews help file I've used a naming scheme that keeps everything very firmly seperate and organized (directory-name filesize width height), which does the job nicely :)

van said:
MDGeist, I remember you posted the code for me for generating md5s:
http://moe.imouto.org/forum/show/741

quite outdated though, as my rename.txt format changed again (into md5;id;tags )

anime mover i progged is also quite helpful (moves downloaded stuff in folders)