Hi,
Photography is its own art form which makes it tough for us potters! What I have been doing is photographing in a totally dark room (I use a light just so I can set up then turn it off) and only use the flash from the camera which is on a tripod. I've got a Nikon Cool Pix P7000 which I got at B&H (in NYC) and that is giving me a very consistent true to color photo. When I did lots of stuff with lighting I got all kinds of variations. I read that a dark room actually allows you complete control over the light as opposed to outdoors, etc. Might be worth a try. I don't find I have to do anything in terms of manipulating the photo - I'm getting the colors which are there. Hope it helps!
Liz