OK, OK, so I know better than this, but you know, sometimes you just forget...
One of my favorite tricks to tone a B&W image in Photoshop is not to use the duotone mode, but to completely desaturate the image (Shift+Ctrl+U) then go into the Hue/Saturation dialogue (Ctrl+U), hit the colorize check box and then play from there.
I was working on a series of three images today. The first one I gave a really nice sepia tone to. (Hue=30, Saturation=10 if you follow the other directions above.)
I followed the same process on the next image in the series, and the color was completely different. Didn't make any sense to me at all. In fact, I was seeing a color shift similar to something I'd seen in the past with a different set of images. This second image was more green/brown than yellow/brown. Really frustrating.
Then, I suddenly realized the problem. The first image I'd toned in LAB mode, the second in RGB. Switched the second from RGB to LAB, desaturated, colorized, and voila! Suddenly my tones match!
Yes, Virginia, it does matter what color space/mode you're in when you mess around with colors -- even if you're following exactly the same process in every other respect. *sigh* Learn from my mistakes my friends, learn from my mistakes....
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