Working with the CHDK ( http://chdk.wikia.com/wiki/CHDK ) for Canon Powershot cameras. Here’s a sample uBasic script for taking two sequential photos to be later combined for an Orton Effect photo.
Script to be copied to your scripts folder as orton.bas
rem Savi Technologies
@title Orton
@param a Exposure Step
@default a 3
@param b Focus Step [x6]
@default b 6if a<1 then let a=2
if b<1 then let b=1get_focus f
rem get_av d
rem get_tv eprint "First Shot..."
click "shoot_full"sleep 5000
for i=-b to -1
f=6*f/(b+6)
next iset_focus f
set_av_rel 0-2
set_tv_rel aprint "Second Shot..."
click "shoot_full"end