Getting an RGB value from a colormap


I'd like to use the colormap interface in a different way than it's used in plotting images. I am plotting a series of curves (using regular old plot), each of which corresponds to the behavior of a biological circuit under a different level of "inducer", ranging from around 0-100. I want to assign the color of each line according to the inducer value, and I want to try out different colormaps to see which I like best.

All I really want is a method that, for a given colormap (jet, pink, hot, hsv, etc), takes a number between 0,1 as input and returns the corresponding RGB value, which I can then use a 'color' argument in a plotting command. (I was sort of hoping that the colormap object itself would provide such a method but I couldn't find any description of it's interface).

Any ideas?