[Tom Line]

We use excel. We use 3 points 0 127 to define one curve, and 3 points above 127 to define the 127 - 255 curve. Then you graph those points and have excel do a trendline and give you the equation.

Now you can just change your 3 datapoint values around and the trendline graph will automatically give you the new equation. You can either type the equation into excel and have it give you the values for a lookupt table (it becomes a simple copy/paste) or you can multiply the equation by 10, 100, or 1000 to remove the floats and simply use the equations with integer math in your program.

Once you have the excel spreadsheet set up, it takes about 30 seconds to change the curves then update your program.