Arithmetic example

Perform a Vegetative Index calculation using channels 1 and 2, saving the result to channel 7. If channel 7 is 32 bit real, the following model is used:

MODEL ON "irvine.pix" OVER dbiw
  %7=(%1-%2)/(%1+%2)
ENDMODEL

If channel 7 is 8-bit, some scaling and adjustment is necessary:

MODEL ON "irvine.pix" OVER dbiw
  %7=((%1-%2)/(%1+%2))*128 + 127.5
ENDMODEL