[magick-users] on destriping again.. low & high pass filter.. how to do pixel algebra in IM

[mattia]

Hello folks,

I found a tutorial which basically uses a low pass filter, a high pass
filter and an "algebraic" combination of the two to remove striping noise
from the image... i.e: just random vertical lines due to apparatus defects
on a satellite board..

I just would like to know how to do pixel algebra in IM... how can I combine
two images into one by pixel to pixel algebra operations...
Would it be the convert -combine option?

Any ideas? suggestions?

-- 
Mattia