After conducting a few tests it is clear that, at least for the bitmap tested, an output RGB level of 8.0 is equivalent to a Corona Color Correct Exposure value of 3.0.
Could someone explain the equivalence mapping between these two modifiers?
That math is correct. Exposure is logarithmic, and multiplier is linear, so an exposure of three is 2 to the power of 3, which is 8:
2 * 2 * 2 = 8
To be more clear, if your original value is 1, then:
+0 exposure = a value of 1
+1 exposure = a value of 2
+2 exposure = a value of 4
+3 exposure = a value of 8
+4 exposure = a value of 16
etc.
It also works the other way too:
-1 exposure = 0.5
-2 exposure = 0.25
-3 exposure = 0.125
etc.
Basically when you are talking in exposures, in terms of whole numbers, you are doubling or halving the amount of light.
Oh man, this is a really helpful explanation. Thank you so much!