Re: X-Rite Passport Inaccuracies
Re: X-Rite Passport Inaccuracies
- Subject: Re: X-Rite Passport Inaccuracies
- From: Daniel Westcott <email@hidden>
- Date: Sun, 22 Sep 2013 01:25:26 -0700
- Importance: normal
Hi justin.
I once lectured on invention at a museum to several groups of school children at various grade levels. I asked the color of an object. Hands shot up. "Red!" I turned out the lights and asked again. The older groups still thought it was red but the youngest groups had the correct answer, black. You can only capture the color that exists when you take your exposure. There are wavelengths in daylight, warm or otherwise, which simply do not exist in CWF and you will never be able to capture something which does not exist. Trying to make a daylight exposure colorimetrically match an exposure taken in a lesser light source may or may not even be possible depending on what color is coming back from the object of the exposure.
My point is that if you wish to have a match, fix your light pre-capture. Your results will be far superior to trying to extrapolate from a few color chips what the exposure would have liked like had the color you wish you had actually been in the room when you made the exposure.
Remember that light is analog and that compression and decompression of an analog signal comes at a cost. Once something is gone you cannot regain it by decompressing. .. would you expect different results if the signal were never there to begin with as is often the case when shooting in light with deficiencies in certain wavelengths (e.g. CWF)?
For what it's worth, $100 is not very much to spend for a useful tool, but you need different and much more costly solutions to accomplish your goals.
Cheers
Daniel Westcott
Perfect logic is meaningless without perfect perspective.
Daniel Westcott
email@hidden
-------- Original message --------
From: Spinnaker Photo Imaging Center <email@hidden>
Date: 09/20/2013 12:16 PM (GMT-07:00)
To: Justin Krug <email@hidden>
Cc: email@hidden
Subject: Re: X-Rite Passport Inaccuracies
On Sep 20, 2013, at 12:13 PM, regarding
>> my issues with the X-rite Passport. My primary purpose for using it is
>> to get accurate and consistent colors across different ambient and
>> artificial light sources for architectural photography. For example, I want the colors in the photo taken with ambient/artificial mixed light to match with those taken under CFL's at night.
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