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Re: lights




        Reply to:   RE>lights 

Benjie,
Yes, there are standards published by SMPTE in the recommended practices
archives.  Unfortunately, many facilities do not use these standards either
out of ignorance or lack of resolve when presented by the interior designers
trendy decor plans.  The recommended practices basically state that the room
should be dimmly illuminated by lighting that is as close to 6500 degrees
Kelvin as possible.  The monitor itself should be placed at least 3 picture
heights in front of the viewing wall and the room decor surfaces should be
neutral gray.  Surfaces can be textured fabrics for visual interest reasons
but definitely should not be colorful if you want reliable color perception
from room to room.  Of course calibrated monitors are also critical for room
to room repeatability.  The wall directly behind the monitor can be
illuminated by a soft spill of light from a 6500 K source no brighter than
10-15% brightness value of full 100% white on the monitor. All lighting should
be placed and directed to not cause reflections on the monitor.  There are
several manufacturers of dimmable flourescent fixtures.  Selected phosphor
flourescent tubes are also on the market for broad spectrum D65 or 6500K color
temperature light.  
You can also purchase dichroic filters for low voltage track light fixtures
that use the MR16 type halogen spots.  These dichroics change the color
temperature to be closer to 6000K than the usual yellowish white Halogen
3600K.  If flourescents are not to your liking then this makes a decent
compromise and room designers seem to be more receptive to their use than
flourescents.  In either case clients can then visually inspect their sample
products in the room light to compare it to what they see on the monitor with
good results.  
Correct room lighting has an enormous impact on the way pictures are perceived
on the monitor.  By calibrating the room decor and lighting just as carefully
as you calibrate the monitor you will be reducing a lot of those "It didn't
look like that down the hall" complaints from clients.
Dave Corbitt

--------------------------------------
Benjie wrote--->
>   There's an on-going debate in the office as to what type of light 
>   would best illuminate a telecine suite. Some prefer a yellowish mood 
>   lighting to create a warm feeling( but this would probably foul up the    
     >   color adjustments made
>   by the colorist).  ............(deletia).........