Re: D50 Illuminant in instrument
Re: D50 Illuminant in instrument
- Subject: Re: D50 Illuminant in instrument
- From: Steve Upton <email@hidden>
- Date: Mon, 19 Apr 2004 10:13:39 -0700
At 11:23 AM -0500 4/19/04, email@hidden wrote:
>
A colleague asked me a question I couldn't answer this weekend so I pose
>
it to this fine list. Why is the standard/default configuration on most
>
measurement devices D50 with a 2 degree observer and how does this relate
>
(or not relate) to things like viewing conditions and working spaces?
Well, a couple of reasons:
- the Lab used in Photoshop and ICC profile connection space is D50 2 degree
- Standard print viewing conditions are D50
>
More
>
to the point, when or why would you ever want to change it (to something
>
like D65)?
Mainly if your viewing conditions differ from D50 and metamerism causes the calculated color balances to fail under the different lighting. ( I should really word this as: Metamerism fails under the alternate lighting condition) Considering that D50 is a theoretical spectral curve and NO man-made light sources match it perfectly, it tends to be HOW FAR away from D50 YOUR lighting is...
Products like ProfileMaker and BasICColor allow you to gather the spectral data from the instrument and then choose a different illuminant for building the profile. Then you can roll your profiles for specific lighting conditions. That is fairly controversial but if you need a proof to match in your light booth it can make all the difference.
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
________________________________________________________________________
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