Simon de Vet <sde### [at] istarca> wrote:
: So.. does vision change over the course of a day? Do I get more contrast
: early in the morning than late at night? The lighting conditions in the
: room and the settings of my monitor did not change.

  I have noticed that I see very badly just after awakening and that it
takes time before I can see perfectly.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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Yes, this is true of all people to different extents.  Generally people's
eyesight is worse in the morning than in the afternoon (well... if you wake
up in the morning that is... I have been waking up in the afternoon and
going to sleep in the morning lately...).

I notice this quite a lot with my vision, it takes at least an half an hour
to an hour depending on how tired I am before my vision is up to scratch
again.

Simon, this is probably a combination of your eyesight in the morning and
also if you have just turned your monitor on (and it's a CRT) it may take a
few minutes (5-10) to really be at optimal color variance levels.  This is
especially true in cold seasons.

--
Lance.


---
For the latest 3D Studio MAX plug-ins, images and much more, go to:
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Nieminen Mika wrote in message <3778dd1a@news.povray.org>...
>Simon de Vet <sde### [at] istarca> wrote:
>: So.. does vision change over the course of a day? Do I get more contrast
>: early in the morning than late at night? The lighting conditions in the
>: room and the settings of my monitor did not change.
>
>  I have noticed that I see very badly just after awakening and that it
>takes time before I can see perfectly.
>
>--
>main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
>):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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>: So.. does vision change over the course of a day? Do I get more contrast
>: early in the morning than late at night? The lighting conditions in the
>: room and the settings of my monitor did not change.
>
>  I have noticed that I see very badly just after awakening and that it
>takes time before I can see perfectly.

Yeah. I haven't noticed this ever myself, but my old maths teacher always
complained about his vision (and screwed up his eyes) if we had him in the
morning lessons. He had a big, red nose so when he screwed up his eyes, he
looked like an old gnome, hehe...

But aren't there any windows at all in the room? Often the light in the
mornings can be very strong and white, at least here in Denmark.

>main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
>):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

I've often wanted to ask what this little babe outputs? Isn't this a new
one?

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> Oh, great gods of all things visual, I present you a question! :)

> Last night I started rendering a pic. At the time I went to bed, it was
> about 1/3 finished, and looked good. Shadows, but not too dark, and
> great colour balance.

> Now, this morning, about 30 min after getting up, I take a look at the
> pic. Now, the shadows are almost fully black, and the colours looks
> garish. Even the 1/3 that I had seen last night.

> So.. does vision change over the course of a day? Do I get more contrast
> early in the morning than late at night? The lighting conditions in the
> room and the settings of my monitor did not change.

	No sunlight? Color balance matters as well as angle to the
screen meaning a glare filter could solve the problem. 

> Very odd.. scared me, too. Looked like my pic was ruined. Hope it looks
> better when I come home this afternoon :)

	After eliminating everything else and it is your eyes, a doctor
is in order. But first look up that vitamin that is needed for
color vision and try it. (D?, carotene) 

	Is the monitor aging? drifting on its own? Try to duplicate it.
Leave it on all night? If you can't duplicate it forget it. 

	Also consider that at night your eyes were reacting to a 2/3
black screen so even the dim areas would stand out. The final
scene not having that black screen is going to see the scene
differently

	I work from noon some times to dawn, most every lighting
condition. The only thing similar (not nearly the degree you
imply and only lasting minutes) lead me to get some small
flurescents in the room lamps and leave them on all night. 

-- 
<blink>-------please--don't-----------------</blink>

http://www.giwersworld.org/artsii/

Finally up on 99/06/22 updated 06/28

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Nieminen Mika wrote:
> 
> Simon de Vet <sde### [at] istarca> wrote:
> : So.. does vision change over the course of a day? Do I get more contrast
> : early in the morning than late at night? The lighting conditions in the
> : room and the settings of my monitor did not change.
> 
>   I have noticed that I see very badly just after awakening and that it
> takes time before I can see perfectly.

It helps me for some work if my monitor is the only source of
illumination in the room.  This is especially important when tweaking
height fields in a paint program and the shades only differ by 1 part in
256.  If I wait until dark, turn off the lights, and tweak with my
monitor.  I even change the other colors on my desktop to avoid brighter
colors.  Granted, that wasn't what the original post was asking...

-- 
Mark Gordon
mtg### [at] povrayorg

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Mark Gordon wrote:

>   This is especially important when tweaking height fields in a paint
> program and the shades only differ by 1 part in 256.

  And I thought I was obsessive when working on input images for HF objects.

-- 
Ken Tyler

mailto://tylereng@pacbell.net

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Ole Laursen <98z### [at] aalborghusdk> wrote:
:>main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
:>):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

: I've often wanted to ask what this little babe outputs? Isn't this a new
: one?

  It outputs the same as always. The layout changed a bit once (now it
calls the main() function recursively instead of making a while-loop).

  Obfuscated C rules.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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On Tue, 29 Jun 1999 08:17:25 -0400, Simon de Vet <sde### [at] istarca>
wrote:

>Oh, great gods of all things visual, I present you a question! :)
>
>Last night I started rendering a pic. At the time I went to bed, it was
>about 1/3 finished, and looked good. Shadows, but not too dark, and
>great colour balance.
>
>Now, this morning, about 30 min after getting up, I take a look at the
>pic. Now, the shadows are almost fully black, and the colours looks
>garish. Even the 1/3 that I had seen last night.
>
>So.. does vision change over the course of a day? Do I get more contrast
>early in the morning than late at night? The lighting conditions in the
>room and the settings of my monitor did not change.
>
>Very odd.. scared me, too. Looked like my pic was ruined. Hope it looks
>better when I come home this afternoon :)
>
>Simon
>http://home.istar.ca/~sdevet

 I think you are seeing the same phenomenon as when looking out your
lit room into the night and the glass is very reflective. Basically,
when it's dark, the light is coming mostly from the screen, and when
it's day some inevitable reflections (5-10%) are visible, even with
the best glare filter etc. That's the reason why PhotoShop asks about
the ambient lightning when setting up display properties. A rule of
thumb I use is to only set up textures and lightning at an
illuminaition level just fine for reading, no more, no less (as this
is the typical set-up in offices and desks at home), and the light
*must* be white.


Peter Popov
ICQ: 15002700

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Just don't give it any command line parameters unless you like crashes.

Nieminen Mika wrote:
> 
> Ole Laursen <98z### [at] aalborghusdk> wrote:
> :>main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
> :>):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
> 
> : I've often wanted to ask what this little babe outputs? Isn't this a new
> : one?
> 
>   It outputs the same as always. The layout changed a bit once (now it
> calls the main() function recursively instead of making a while-loop).
> 
>   Obfuscated C rules.
> 
> --
> main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
> ):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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Hej - just found this "old" thread...

> So.. does vision change over the course of a day? Do I get more contrast
> early in the morning than late at night? The lighting conditions in the
> room and the settings of my monitor did not change.

Counting together all the points already mentionned and adding two own
comments:

- after switching on the monitor (or after stopping a blanking screen
saver!) 
  it takes a while for the monitor to warm up and show the same
contrast/brightness
  as it was on for say some hours

- after waking up, the human eye needs to adapt from the relaxed (dark)
state
  to the actual viewing state. As our brain is a wonderful machine, it
often 
  does not allow you to notice this!
  It might take some ten minutes for an eye to adapt to a completely
different
  light situation (darkness/light, room light/sunlight ...)

- again our brain: The part of it responsible for vision also
accomodates to
  different light temperatures by shifting the "white" impression. When
using
  electrical lightning (this is mainly true for bulbs) the light
temperature is
  in the range of 2500 K while a blue morning sky (or daylight
fluorescent tubes or
  a monitor screen!) gives a light temperature of beyond 5000 K. A color
that 
  seems to be white at 2500 K might appear yellow when seen at an 5000 K 
  illumination. 
  The adaption between different light temperatures might take as well
some time 
  and may even differ from one eye to the other (without the need to see
a doctor 
  for that - he couldn't do anything against it).

But perhaps you could tell us now, how your pic looked like when you
came back....


Uwe.

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