Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Andrew Rodney <email@hidden>
- Date: Wed, 05 Jun 2013 10:55:39 -0600
On Jun 5, 2013, at 10:41 AM, Ben Goren <email@hidden> wrote:
> Actually looking at Bruce Fraser's values, what instantly leaps out at me is that the neutral patches all perfectly lie on the neutral axis. That's not the case of any ColorChecker I've ever encountered in the real world -- though, to be sure, the quality and consistency of ColorCheckers has been exemplary.
>
> Compare Bruce Fraser's values with those that Bruce Lindbloom has here:
>
> http://www.brucelindbloom.com/index.html?ColorCheckerCalculator.html
Bruce Fraser's Lab values from the target are based on Lab values supplied by Chris Murphy** which he states in the piece and those values differ a bit from Lindbloom.
But it doesn't matter because Bruce produced a colorimetric match (the numbers Chris measured/produced and the number ACR provided).
**
> Macbeth ColorChecker (LAB): Based on the Macbeth Color Checker target used by photographers, this digital file version contains the unpublished LAB values for the 24 patches that Bruce has collected over the years from various targets (with considerable help from Bruce Lindbloom and Robin Myers).
Andrew Rodney
http://www.digitaldog.net/
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