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>You don't really have to have a blank frame - if you can zoom into a blank area an then measure the white balance there, that's it. It would also help to know where does your camera actually measure the white balance - does it take the average of the whole view, or is it center-weighed, or just a center area etc. You should usually be able to find sufficient blank space at the end of the roll. But then for those where it was just narrowly cut, you may be out of luck - finding a similar color blank strip may help to get it sufficiently close to some balance which can then be fixed by software.

My digital camera is a pretty nice one, a Nikon Cool Pix 5700. As nice as it is, what you can do with white balance is not what I had expected. By default you have "A" for automatic, or you can change it to 1 of the 6 white balance presets. I took the same shot with each setting. Then with software made a negative of it, and after telling it to auto fix the color, it looks pretty good. What I have now is not perfect, but very close. Much better than what I was getting. Thanks.