3.9 What is edge enhancement?
Description
This article is from the DVD Formats FAQ, by jtfrog@usa.net (Jim Taylor) with numerous contributions by others.
3.9 What is edge enhancement?
When films are transferred to video in preparation for DVD encoding, they
are commonly run through digital processes that attempt to clean up the
picture. These processes include noise reduction (DVNR) and image
enhancement. Enhancement increases contrast (similar to the effect of the
"sharpen" filter in PhotoShop), but can tend to overdo areas of transition
between light and dark or different colors, causing a "chiseled" look or a
ringing effect like the haloes you see around streetlights when driving in
the rain.
Video noise reduction is a good thing, when done well, since it can remove
scratches, spots, and other defects from the original film. Enhancement,
which is rarely done well, is a bad thing. The video may look sharper and
clearer to the casual observer, but fine tonal details of the original
picture are altered and lost.
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