Lighting question: Illuminance? (RWCM)
Lighting question: Illuminance? (RWCM)
- Subject: Lighting question: Illuminance? (RWCM)
- From: Peter Karp <email@hidden>
- Date: Thu, 22 Jan 2004 12:06:45 +0100
Hi,
this posting is addressed mainly to the authors of RWCM, but I'm
interested to hear any comments :-)
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?
A typcial CRT will achieve a luminance of 85 cd/m^2. A matching illumance
would be around 270 lux. TFT's can achieve up to 200 cd/m^2 (sometimes a
tad higher) which matches an illumance of about 630 cd/m^2.
On page 210 in Real World Color Management it's stated that
the ISO-Standard wasn't created with monitor-to-print machtings in
mind. The ambient illumination for color monitors should be less or
equal to 32 lux and _must_ be less than or equal to 64 lux. For
monitor print matching, all these values would be too high.
1) "These values are way too high" refers to the ISO recommendations or
to the low illumance values of about 50 lux?
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?
My questions boil down to these one:
Which illuminance would you suggest for the ambient light and for the
light in a viewing booth (and why)?
Looking forward to hear your comments.
Kind regards
Peter
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