Inverting a range?

[steveo]

Jon,
If I have a variable that outputs a range, say 60 descending to 1. But I need to use that value inverse, so the 60 to 1 range is equal to 195 to 255.

The value comes from the ping sensor, so this is being generated in real time.

Is there an operation that will do this? If not, how would you do it?

[JonnyMac]

The answer is deceptively simple:
 
  newVal = 256 - oldVal

[steveo]

My brain just feels very embarrassed right now. And it should be.