Very sensible advice. Thanks. I think we get so involved in what we're doing that we forget the obvious. So here's what I should have said at the top:

This script makes it much easier to adjust the size of my tileable mail textures (in the Renderosity Freestuff here) to suit the item it's applied to. It should also be suitable for adjusting any texture that uses a tiled image map. Or to follow on from that Saturday Night Live sketch - "Don't you just hate it when that ballista bolt goes straight through the holes in your chain mail? You should have been using smaller links - if only you'd had this handy little Tile-O-Matic script!"

I had been trying to do this with a Poser 5 material file, but advice in this thread pointed me to Python, and once I'd got the script more-or-less ready I moved to this thread you're looking at (but forgot to point back to the original thread).

It's my first ever Python script, which is the main reason I've asked for comments. I'm still debugging it, but I posted it since it seems to work 99% as intended (testing in Poser 6 on Windows 7).

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).