Keith Willshaw

"Mxsmanic" <[email protected]> wrote in message
news:[email protected]...
    > Tim Challenger writes:
    >> That's not natural, that's either 'ambient' or 'common', or both, neither
    >> of which imply a natural source.
    > What's a "natural" source?

One that occurs in nature

    > Is sodium man-made?

No but Sodium discharge lamps are

    > Is lightning a natural
    > source?

Certainly - of multichromatic light

    >> How would *you* define "natural" in this context?

    > Something encountered in photography that doesn't use flash or other
    > artificial light designed specifically for taking photographs.

Just so

    >> You missed out bioluminescence, red-hot lava, lightning and arauras. Dear
    >> me, you're not getting enough sleep are you?
    > What are arauras?

Multicolored discharges cause by the collision of high energy
electrons with gas atoms

Keith

nitram

On Wed, 15 Dec 2004 10:48:32 +0100, Tim Challenger
<[email protected]> wrote:

    >On Wed, 15 Dec 2004 10:42:36 +0100, [email protected] wrote:
    >> On Wed, 15 Dec 2004 05:32:20 +0100, Mxsmanic <[email protected]>
    >> wrote:
    >>
    >>>Keith Willshaw writes:
    >>>> And just how do they manage to be classified as natural ?
    >>>You see them in scenes you photograph, and you photograph scenes lit by
    >>>them.
    >>>If you mean "not man-made," about the only light source that comes to
    >>>mind is sunlight.
    >>
    >> Sunlight is monochrome?
    >Yes, it's "sunlight" coloured. Doh!

High pressure sodium, and mercury vapour street lights do not produce
monochromatic light.

"Mercury vapour lamps emit light in the blue-green range which
accentuates the green colour of plants. High-pressure sodium lights
are highly efficient. They emit more yellow and red wavelengths which
doesn't do much for the colour of anything"

Nobody mentioned "Fanny by gas light"
--
Martin

Miguel Cruz

Mxsmanic <[email protected]> wrote:
    > Keith Willshaw writes:
    >> And just how do they manage to be classified as natural ?
    > You see them in scenes you photograph, and you photograph scenes lit by
    > them.

Ah, so a "natural source of light" in the same sense as a fluorescent tube
or an incandescent table lamp. Or a flashlight or a car's headlights or a
high-energy laser in a physics lab. Well, that's certainly going to be a
useful term in the future.

miguel
--
Hit The Road! Photos from 32 countries on 5 continents: http://travel.u.nu

The Reids

Following up to Mxsmanic

    >> You typed "USENET".
    >USENET is an acronym, customarily typied in uppercase letters, like
    >NORAD or USA.

What does it stand for?
--
Mike Reid
Wasdale-Thames path-London-photos "http://www.fellwalk.co.uk" <-- you can email us@ this site
Eat-walk-Spain "http://www.fell-walker.co.uk" <-- dontuse@ all, it's a spamtrap

Magda

On Wed, 15 Dec 2004 10:52:47 +0100, in rec.travel.europe, [email protected] arranged some
electrons, so they looked like this :

... On Wed, 15 Dec 2004 09:58:12 +0100, Magda
... <[email protected]> wrote:
...
... >On Wed, 15 Dec 2004 09:56:23 +0100, in rec.travel.europe, Tim Challenger
... ><[email protected]> arranged some electrons, so they looked like this :
... >
... > ... On Wed, 15 Dec 2004 09:43:24 +0100, Magda wrote:
... > ...
... > ... > On Wed, 15 Dec 2004 09:13:14 +0100, in rec.travel.europe, Tim Challenger
... > ... > <[email protected]> arranged some electrons, so they looked like this :
... > ... >
... > ... > ... I never said he shouted. Mike did. Mixi said he didn't type in capitals,
... > ... > ... but he did.
... > ... >
... > ... > He is contradicting himself now ? There is no one left ?
... > ...
... > ... It depends on hw you define "contradict". :-)
... > ... I'll get my coat.
... >
... >LOL
...
... Define LOL and stop shouting it out loud :-)

Be careful, it's contagious ! :))

Magda

On Wed, 15 Dec 2004 10:49:39 +0100, in rec.travel.europe, [email protected] arranged some
electrons, so they looked like this :


... >A whole sentence/post in capitals is shouting. One word is emphasis.
... >In my book, at least.
...
... You have stolen Mixis book of what words really mean.

Stop insulting me, I can write my own book ! Hmpfff !

nitram

On Wed, 15 Dec 2004 10:45:59 +0000, The Reids
<[email protected]> wrote:

    >Following up to Mxsmanic
    >>> You typed "USENET".
    >>USENET is an acronym, customarily typied in uppercase letters, like
    >>NORAD or USA.
    >What does it stand for?

Anything he likes, this thread is the Alice in Wonderland theme park.
--
Martin

nitram

On Wed, 15 Dec 2004 11:50:41 +0100, Magda
<[email protected]> wrote:

    >On Wed, 15 Dec 2004 10:52:47 +0100, in rec.travel.europe, [email protected] arranged some
    >electrons, so they looked like this :
    > ... On Wed, 15 Dec 2004 09:58:12 +0100, Magda
    > ... <[email protected]> wrote:
    > ...
    > ... >On Wed, 15 Dec 2004 09:56:23 +0100, in rec.travel.europe, Tim Challenger
    > ... ><[email protected]> arranged some electrons, so they looked like this :
    > ... >
    > ... > ... On Wed, 15 Dec 2004 09:43:24 +0100, Magda wrote:
    > ... > ...
    > ... > ... > On Wed, 15 Dec 2004 09:13:14 +0100, in rec.travel.europe, Tim Challenger
    > ... > ... > <[email protected]> arranged some electrons, so they looked like this :
    > ... > ... >
    > ... > ... > ... I never said he shouted. Mike did. Mixi said he didn't type in capitals,
    > ... > ... > ... but he did.
    > ... > ... >
    > ... > ... > He is contradicting himself now ? There is no one left ?
    > ... > ...
    > ... > ... It depends on hw you define "contradict". :-)
    > ... > ... I'll get my coat.
    > ... >
    > ... >LOL
    > ...
    > ... Define LOL and stop shouting it out loud :-)
    >Be careful, it's contagious ! :))

ROFLMAO, call a doctor.
--
Martin

The Reids

Following up to The Reids

    >The convention is *emphasis* or _emphasis_.
    >There is of course the possibility usenet is an acronym?

Its Users Network, so its not properly an acronym, you could type
UseNet I suppose.
--
Mike Reid
Wasdale-Thames path-London-photos "http://www.fellwalk.co.uk" <-- you can email us@ this site
Eat-walk-Spain "http://www.fell-walker.co.uk" <-- dontuse@ all, it's a spamtrap

The Reids

Following up to [email protected]

    >>>USENET is an acronym, customarily typied in uppercase letters, like
    >>>NORAD or USA.
    >>What does it stand for?
    >Anything he likes, this thread is the Alice in Wonderland theme park.

It seems only one out of the three examples is an acronym, NORAD.
--
Mike Reid
Wasdale-Thames path-London-photos "http://www.fellwalk.co.uk" <-- you can email us@ this site
Eat-walk-Spain "http://www.fell-walker.co.uk" <-- dontuse@ all, it's a spamtrap

nitram

On Wed, 15 Dec 2004 11:33:04 +0000, The Reids
<[email protected]> wrote:

    >Following up to [email protected]
    >>>>USENET is an acronym, customarily typied in uppercase letters, like
    >>>>NORAD or USA.
    >>>What does it stand for?
    >>Anything he likes, this thread is the Alice in Wonderland theme park.
    >It seems only one out of the three examples is an acronym, NORAD.

He must have blundered :-)
--
Martin

[email protected]

The Reids wrote:
    > Following up to [email protected]
    > >> Andrew who?
    > >
    > > MsxManic = Andrew
Sorry, I got my pedants mixed up. This one is Anthony.

[email protected]

The Reids wrote:
    > Following up to [email protected]
    > >1) Filters operate on more information than any
    > >post image capture.
    > >
    > >2) As hard as one may try, once data (information)
    > >is lost, it cannot be recreated from the filtered data.
    > >
    > >3) You can approximate many of them really, really
    > >close. But some you can't do at all. (Because the
    > >information is gone)
    > Yes,polarisers etc, excluded from day 1.
    > All of this is true, the problem is Mixi presents it as a
    > catastrophic difference, when it is as you say, marginal.
[snip]

The degree of catastophy will depend upon exactly what one
is doing, what one wants to do with the image, and what the
individual standards of the person doing it are.

Anthony mentioned some specific cases which would be more
notable. The one that is more of an issue in our business
is the color effect do to frequency shift. I think the specific
case mentioned was where a UV content gets recorded as a
blue hue moslty notice in white. That's hard to get rid
of in the same manner as filtering because post processing
demands you get rid of blue, which means affecting the
"true" blue in the image. You can try to only correcting
say "white" but you will then affect true "white". You
can try doing a color by color correction, but you kinda
have to know the reflectivity of each color and material as well.
It's pretty hard. Most of us are just happy to turn white
back to white and accept the slight shift in "true blue".
It can change the shade of some of your greens though.

nitram

On 15 Dec 2004 04:57:26 -0800, "[email protected]"
<[email protected]> wrote:

    >The Reids wrote:
    >> Following up to [email protected]
    >> >> Andrew who?
    >> >
    >> > MsxManic = Andrew
    >Sorry, I got my pedants mixed up. This one is Anthony.

So who is Andrew?
--
Martin

Keith Willshaw

"Miguel Cruz" <[email protected]> wrote in message
news:[email protected]...
    > Mxsmanic <[email protected]> wrote:
    >> Magda writes:
    >>> A whole sentence/post in capitals is shouting. One word is emphasis.
    >>> In my book, at least.
    >> In this case, it's just an acronym.
    > And what does it stand for then?
    >> USENET has traditionally been in all uppercase, although there's a lot of
    >> variation these days.
    > Last time I saw it in all uppercase was back in the BITNET days when some
    > of
    > the protocols involved couldn't deal with lowercase letters. That's sort
    > of
    > a long time ago. And it's also like insisting on calling someone STEVEN
    > because that was the name of his PRIMOS account in 1977.

In that case you can call me KEITHW - which was my Primos login

Keith