Polarizing effect via software

The photograph was taken with the Rolleiflex 3.5F, Planar 3.5/75, Agfachrome RSX 100. The first image (below) is the original scanned image. The second image received an edition software manipulation to simulate a polarizing filter effect, the effect is not so good like using a true polarizing filter but it could be useful for analog and compact digital cameras that couldn't use a filter for some reason (click on thumbnail for a bigger image).