In article ,
Mr.T MrT@home wrote:

"Dave Plowman (News)" wrote in message
...
That's more to do with the relative sensitivity of film color layers
etc.
They are specifically balanced for Daylight or Tungsten, and are
wildly innacurate when used with the wrong light source.

In which way are they 'inaccurate'? They will look wrong to the eye on
a 'cut' but as with real life if all shots are matched the eye will
accommodate.

Not so. They ARE wrong. The relative densities of the individual film
layers will be quite innacurate when exposed with the wrong light.

You conveniently snipped the part about video. And a daylight film can
also look 'wrong' when taken in daylight of the wrong colour temperature.
Which can be corrected by filters when taking the pic or processing it.

The monitor you're reading this on is unlikely to match
*exactly* another one in colour temperature but will look ok to the
individual. The eye compensates, as I said, as it must do given that
daylight changes. Unless it has a reference to match to.

Which is everything else within your field of view. Only if *everything*
changes will the *brain* correctly compensate.

Not so - do you change the colour temperature of your TV or monitor
according to the ambient light? The brain focuses on the important part
after time - within reason.

Err, yes. That's what I said. But it doesn't react instantly. Hence it
notices a sudden change in colour temperature. Like switching on 4500K
lights in a house when it gets dark.;-)

So a couple of minutes readjustment is abhorent to you?
Doesn't bother me too much.

Fine - but you're in a minority if you like cold domestic lighting.

Have you never wondered why most prefer the colour temperature of
tungsten for domestic lighting?

No, as I already stated it was simply conditioning from fires, candles,
oil lamps and tungsten filament globes.

Fluorescent lights have been around for a long, long time. And early ones
were all cold compared to tungsten. People could easily have got used to
them for domestic light, but very few chose to.

Have you ever wondered why people aren't bothered by the change from
daylight, or in fact are able to wear coloured sun glasses, but can
readily pick an off balance color photo?

Can they? Depends on their skills. Have you never noticed how many people
are happy with a TV where the grey scale is miles out?

--
*Sometimes I wake up grumpy; Other times I let him sleep.

Dave Plowman London SW
To e-mail, change noise into sound.