color mapping

[giraffe]

under some topics I read some questions like "do you use color mapping?"
but I couldnot find any way to de-activate color mapping.by default it is linear and dark:1 light:1.

first I thought when these values are both 1, it is inactive but:

I made test renders with "linear dark:1 light:1" and then "hsvv dark:1 light:1" and "exponential dark:1 light:1" and they all came out to be different.
can someone explain this to me?

[dusan]

well
people refer to "liean dark:1 light:1" as no color mapping, while any kind of exponential, even 1,1 is color mapping,

but im not really sure why all of this isnt called "exposure"

[giraffe]

thanks dusan