There isn't any single good reason to keep buying a 32 bit OS today.
I have a netbook with an Atom.
But, other than that, you're right.
Well, and apparently people with Photoshop:
For example my converter for *.tga 32-bit to *.png 32-bit, Photoshop plug-ins
humm, strange, but okay, Photoshop must be doing something at low levels of the CPU (at the register level) for something like that to be affected. I guess they're probably doing oprimizations in ASM or something.
I've been using the GIMP, seems to be fine. Not as powerful as Photoshop, but it'll perform conversions fine. Although I'm not sure if you're talking 32 bits overall (8 bits/color, RGBA) or 32 bits/color?
The GIMP, unfortunately, doesn't support HDR yet .
In your situation, yeah, that makes sense.
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That's likely to change in the near future. Stardock is pushing hard to bring their stuff up to 64 bit.