View Single Post
  #21  
Old 04-12-2016, 10:54 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: 7,184
Getting slightly further off-topic (sorry), this also relates to safe action area and safe title area in production. The safe title area used to be a reduction in width and height of 10% on each of left and right edges, the top, and the bottom (20% total each way).
The latest EBU recommendation
https://tech.ebu.ch/docs/r/r095.pdf
reduces this by half to 5% on each edge, but a web search shows many continued recommendations for 10%, which seems excessive these days.
Flat panel sets do incorporate some overscan in order to hide any black edges that might arise from legacy analog video having excessive blanking time.

Early color cameras would often have round-tube outlines drawn on the viewfinder inside the safe title or safe action area. Image orthicon cameras were often set up with enough overscan that the edges of the target appeared as dark areas in the four corners of the raster. No one expected these to ever be visible, even on rounded-rectangle monochrome sets. Nowadays, these can be seen on home flat screen sets when viewing DVDs of classic shows.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote