@echo off
setlocal enabledelayedexpansion
mkdir tmp
mkdir out
for %%f in (*.tif) do (
  echo resize: %%f
  <IMAGEMAGICK> <IMTOOL> %%f -resize 50%% -filter Gaussian ./tmp/_%%f
  echo invert
  <IMAGEMAGICK> <IMTOOL> <IMPARAMETERS>
  )
pause