View Single Post
  #7  
Old 07-08-2018, 05:16 PM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 4,863
Quote:
Originally Posted by Adlershof View Post
IO tubes had such an effect naturally (the one that produced the infamous dark halos around bright lights).

---

VHS: In fact it is a surprise that people had put up with this quality at all.
The IO halo had to be suppressed in color cameras by operating below the "knee" because bright colored objects would have produced complementary-color haloes. Special IO tubes were produced for color that had a higher knee point. In monochrome, operation above the knee was used deliberately, as stated, to enhance edges while providing an approximate sort of gamma correction.

Regarding VHS quality, the old saying is "Content is king."
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote