option "config" - "Config file" string no
option "verbose" v "Verbose" flag off
-option "input1" i "Input 1 image filename" string yes
+option "input1" i "Input 1 image filename" string no
option "input2" j "Input 2 image filename" string no
option "input3" k "Input 3 image filename" string no
-option "output" o "Output image filename" string yes
+option "output" o "Output image filename" string no
option "angle1" a "First angle (degree)" float default = "0" no
option "angle2" b "Second angle (degree)" float default = "0" no