Hi, been using my Acer scanwit 2720s for about 20 rolls of negatives.....no ICE so always need to ensure my negatives free of dust scratch before i scanned.
on the other hand, i read from Armateur Photographer that those with ICE scanner required more time (mutilple pass) per frame scan.....normally i scan a 36 exp roll with about 1.5 - 2 hrs, already feel very tired...
but i think ICE should work and really save the trouble on 'photoshoping' your scan image after that....
It uses an additional Infra-Red channel to scan the film, so that only the dust and scratches are visible in that channel. Using this additional information, the touch-up algorithm can target the specific areas on the scanned picture affected by dust and scratches.
That's why it is more effective than PS's dust and scratches filter, because looking at RGB only, the software has no way to determine the areas affected by dust and scratches, thus have to apply global filtering (similar to blurring), which is not very effective and degrades the entire picture.