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Re: aliasing was Re: filmscanners: Review of the Nikon CoolScan 4000
"Dave King" <kingphoto@mindspring.com> wrote:
> Do you mean jaggies are all through the image, or along the edges?
The jaggies are through the entire image but are most noticeable on high
contrast edges within the image. By "edge" I presume you mean the outer
boundary of the entire image. The jaggies are regular slippage of the
scan lines in a sawtooth pattern. They are apparently caused by the
scanner mechanism moving at a particular speed - one which happens
most often when using Nikonscan that scans in 64K blocks. Ed has
coded Vuescan to scan line by line with a delay to prevent the
vibration that results in the jaggies.
If you're lucky enough to have an LS2000 you could probably also
eliminate the problem by using the multiscan option since it causes
the scanner to scan each line multiple times, slowing the mechanism
down. The LS30 doesn't support single pass multiscanning.
Rob
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