Re: Colorimetric Accuracy in the Field
Re: Colorimetric Accuracy in the Field
- Subject: Re: Colorimetric Accuracy in the Field
- From: Robin Myers <email@hidden>
- Date: Wed, 05 Jun 2013 10:20:38 -0700
Adjusting the RGB values for the neutral patches to be equal in value is roughly equivalent to making the values "relative colorimetric". When used with matrix profiles it improves the resulting images and correlates with user expectations.
Robin Myers
On Jun 5, 2013, at 10:04 AM, Ben Goren wrote:
> On Jun 5, 2013, at 9:55 AM, Andrew Rodney <email@hidden> wrote:
>
>> 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 do those values match those of the actual ColorChecker Bruce Fraser photographed?
>
> As I wrote, the quality and consistency of the ColorChecker is commendable, but it *IS* a mass-produced item and differences of a few DE aren't at all uncommon. And those differences can easily become significant with the age and condition of the ColorChecker.
>
> I'll bet you a nice dinner at a restaurant of your choice in the Phoenix metropolitan area that the N9.5 patch on Bruce Fraser's personal ColorChecker is at least a few DE from the L*=96.14 a*=0.00 b*=0.00 he assumed it was.
>
> b&
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