Re[2]: Lighting question: Illuminance? (RWCM)
Re[2]: Lighting question: Illuminance? (RWCM)
- Subject: Re[2]: Lighting question: Illuminance? (RWCM)
- From: Peter Karp <email@hidden>
- Date: Tue, 3 Feb 2004 13:36:55 +0100
Dear Chris,
thank you for your feedback.
>
> I begin to wonder what illumance is "ideal" for proof/softproof
>
> comparisons and/or for working with digital images. In germany the
>
> FOGRA
>
> suggests 2000 lux (like specified in ISO 3664) for color critical
>
> comparisons. This would mean that a display would have a similar
>
> brightness when the luminance of the display is about 600 cd/m^2. As
>
> it's
>
> important to match the brightness of the display and the viewing
>
booth
>
> --
>
> and no display for prepress/photographers I'm aware of offers such a
>
> high
>
> luminance -- I wonder which illuminance should _today_ in practice be
>
> used?
>
>
The main point is that you're not going to get a correlation between
>
display and viewing conditions if you follow ISO 3664. You'll have to
>
make the adjustment mentally recognizing that under "practical
>
appraisal" of 500 lux viewing prints will be brighter and more
>
saturated than the display. When viewing under "critical comparison" of
>
2000 lux viewing prints will be a whole lot brighter and a lot more
>
saturated than the display, as well as having more contrast.
Ah, o.k. Thanks for the clarification. This was not clear to me from the
book. But I surely agree.
>
> 2) Why should an illumance be below 64 lux in all cases? Is this
>
> recommendation only for the ambient light or for the proof light?
>
>
Ambient light for the room in which the color monitor used for editing
>
is placed.
I see.
>
> Which illuminance would you suggest for the ambient light and for the
>
> light in a viewing booth (and why)?
>
>
That's on page 214 :) Basically you want an adjustable viewing box and
>
pair its brightness down to match that of the monitor.
I understand this demand, but my question also pointed to the ambient
light which does not light the proof. I meant the general "room lights".
When I understand you correct you suggest an ambient light of something
like 64 lux, but not a specific ratio of the proof light to the ambient
(room) light? The illuminance of the proof and the luminance of the
display should match of course, but that still leaves much room for
choosen illuminance level of the ambient light. And nowadays TFT's can be
significant brighter in comparison to CRT's. I hope that high brightness
displays, covering a big gamut, will be available in the not too far
future also :-)
Thanks again for your answer.
Kind regards
Peter
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