Digital BW, The Print

But in the start of this thread Johnny was intentionally matching
illuminance (display) with luminance (photo view box) which I think is
correct.  Whether he was using the more common white point could perhaps be
discussed but I was wondering why Lou would suggest a difference between the
two.  If you know that your prints are going to be displayed in a particular
light proofing them in a different light is not much help ie you should
change the light box as well as the display white point.  Maybe the gurus
aren't really interested in monitor proofs just the light box ones but that
seems very odd.


> From: Ernst Dinkla <E.Dinkla@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Fri, 18 Mar 2005 17:30:04 +0100
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] Re: Correcting exposure for Gray Gamma 1.8
> 
> 
> Louis Dina wrote:
> 
>> Steve,
>> 
>> Most of my previous post has to do with calibration for a color
>> environment.  Since I do both color and B&W, I want settings that
>> work for both.  
>> 
>> Lou
>> 
>>  
>> 
> It is the same for me. And I measure the luminance of my screen,
> lightbox and viewing lights. And profile monitor and printer with the
> Spectrocam. The point that I tried to get across is that when there's a
> difference in illumination whether in your setup in the studio or when
> the prints are in a gallery somewhere else it makes good sense to adapt
> the color temperature of the light to the amount of light. According to
> their messages many of the gurus  use the 6500K for the monitor and a
> much lower number for the lightbox etc so there's no strict rule for it.
> Based on that I presume there's a difference in
> illumination too in their case. Kruithof gives the relation between the
> illumination level and preferred color temperature, it is still a wide
> band and not a single curve so there's some slack.
> 
> Ernst