How to adjust values to a new range

[Demon]

Since you have done it in PBP and if you don't mind, could you post the code you tested please? ....

Sure thing:

ADCinput    var WORD
ADCcalc     var WORD
ADCinLow    con 0
ADCinHigh   con 255
ADCoutLow   con 100
ADCoutHigh  con 235
        ADCcalc = ADCinput / 4          ' reduce to 0-255 to avoid WORD overflow
        ADCcalc = (ADCcalc MAX ADCinlow) - adcinlow ' adjust 0 - 255 range
        ADCcalc = ADCcalc * (ADCouthigh - adcoutlow)'   to 100 - 235 range
        ADCcalc = ADCcalc / (adcinhigh - adcinlow)
        ADCcalc = ADCcalc + ADCoutlow
        ADCcontrast = ADCcalc MIN ADCouthigh

I just kept things simple and did things one step at a time, just like Jerson explained it. And women say men can't follow instructions.

I know I can shrink this, but I'm just researching all the different bits of code I will need first, and documenting with comments what the code does and why.