In article <firstname.lastname@example.org>,
Radium <email@example.com> wrote:
> On Sep 3, 8:27 pm, isw <i...@witzend.com> wrote:
> > In article <1188874984.222039.197...@y42g2000hsy.googlegroups.com>,
> > Radium <gluceg...@gmail.com> wrote:
> > > Hi:
> > > Clipping in an audio signal results when an audio device receives a
> > > signal that is too loud. The audio signal distorts into square-waves
> > > because the "tops" of the signal are flattened. The device cannot
> > > handle power levels over a certain level. When this level is exceeded,
> > > clipping occurs. Clipping is usually harsher in digital devices than
> > > in ****og devices. ****og clipping tends to be fuzzy and soft compared
> > > to digital clipping.
> > > What is the visual-equivalent of "clipping"? Is there a difference
> > > between ****og and digital in terms of visual-clipping? If so, what is
> > > the difference?
> > Clipping causes whites lose all texture -- very similar to overexposed
> > film.
> What does this look like on a screen?
Just as I said: white areas with no texture.
> > > Auditory-clipping can damage speakers. Can visual-"clipping" damage
> > > monitors?
> > No. Prolonged blacks can damage television transmitters, however (video
> > is inverted for transmission, so black requires full power from the
> > transmitter).
> Prolonged black can damage a monitor/screen? That's weird. White is
> ****ogous to the loudest sound a loudspeaker can playback. Black is
> ****ogous to a loudspeaker not being feed any signal.
I did not say "monitor"; I said "transmitter". There *is* a difference.
> When the power-supply of the monitor/screen is turned off, the monitor/
> screen is black because it not receiving any voltage.
It's not voltage; it's current, that determines brightness during the
normal operation of a monitor.
> I would think that extremely-bright white would damage the screen
> because the brightest white results from the highest voltage applied
> to the Reds, Greens, and Blues [equal intensities of R, G, & B -- if
> combined -- appear white to our eyes when emitted by an electronic
> monitor] in a particular area of the monitor/screen.
Actually it's not voltage; it's current.
And it takes a long time for overdriving to cause damage to an ordinary
> Wouldn't something similar happen to a
> monitor/screen [whether it's a CRT, plasma, or LCD] if it was forced
> to display light-intensities beyond its limits?
CRT's possibly, over a long period of time. LCDs, never. The LCD part is
just a bunch of "valves"; the light source is usually a fluorescent lamp
of some sort. No possibility of "burning anything out".
I have been involved with very special CRT-based imaging devices where
an uncontrolled momentary pulse would destroy the phosphor -- and in
fact, *drill a pit in the glass of the faceplate*. But that is unlikely
to ever happen to a CRT used as a video monitor.