[Gllug] Two Questions

[Chris Bell]

On Wed 09 Feb, Nix wrote:
> 
> On Wed, 9 Feb 2005, David Damerell prattled cheerily:
> > OTOH the two are not directly comparable; 60Hz will boil your eyeballs
> > on a CRT,
> 
> Will it? It's fine here, as is 78Hz and 92Hz.
> 
> 50Hz under fluorescent or incandescent light, on the other hand, is
> insane. :)
> 

   The combination of eye and brain appear to naturally work at the sort of
frequencies known to give flicker effects, but the early cine film workers
soon discovered that doubling the frequency by flashing the light twice for
each frame removed most of the annoying effects.
   There are different screen phosphor persistences available for different
purposes. Broadcast TV runs on a 50Hz field interlace, 25Hz full picture,
rate so standard TV's are usually supplied with a medium persistence
phosphor screen. Computer monitors are generally sold by size rather than
quality, so who cares about things like gamma, colour integrity, and
phosphor persistence as long as it is cheap? Who bothers to fit expensive
long persistence colour matching room lighting?



-- 
Chris Bell

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