Re: LCD's and Room Illumination
Re: LCD's and Room Illumination
- Subject: Re: LCD's and Room Illumination
- From: David Scharf <email@hidden>
- Date: Sun, 11 Nov 2007 20:26:12 -0800
Rodney (or is it, whatz up D-Dog?)
The last part of the chain is arguably, the most important instrument:
Your eyes. I never saw a perceptible difference from working in a
blackened room, which I found very uncomfortable and unworkable to
working in a room with dimmed lights, where the ambient light actually
had the effect of making my blacks look just as dark or darker (perhaps
due to pupil constriction). I a blackened room, it seems as if the
blacks in my image compete with the room darkness. Its also possible
that in a very dark room, with an image that is very bright, just the
light reflecting off of your face can cast some illumination back onto
the screen. I guess we can blacken our faces too and be "pixel
commandos" (he, he).
Regards,
David
--
*DAVID SCHARF PHOTOGRAPHY*
Scanning Electron Microscopy
Los Angeles, CA 90039
http://www.scharfphoto.com
Andrew Rodney wrote:
On 11/11/07 3:57 PM, "email@hidden" wrote:
While I recognise your knowledge and experience in this field it is your
common sense in the
application that is probably your most valaubale trait. Having dispensed with
the flattery I would
like to say that I am perplexed by the necessity to have such low ambient
lighting conditons.
Lower ambient light means less light striking the display for one. Its about
how you want to control the contrast ratio of the unit where the black is
affected by this light. When you measure black using the instrument, this
naturally isn't being considered (the instrument blocks all ambient light
from hitting that area of the display). The black it measures and the black
you view are not the same. Lower ambient light diminish this issue for
obvious reasons. It is for this reason I say, based on conversations with a
display designer, that you can't have too low an ambient light. Some would
argue that too low would make it difficult to work (walk around, find your
computer glasses) in the room which I will accept. None the less, the lower
the level, the less effect on the display itself.
At some point, we hope to view the print and the display so, the ambient
light will raise just from the viewing booth. Obviously we want to ensure as
little of this light strikes the display as possible.
That said, 20 lux is pretty dim. But if we're measuring 20 lux right next to
the display, its affecting the black of that display no?
Andrew Rodney
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