Re: X-Rite ColorChecker Passport
Re: X-Rite ColorChecker Passport
- Subject: Re: X-Rite ColorChecker Passport
- From: Robin Myers <email@hidden>
- Date: Tue, 15 Jun 2010 22:55:59 -0700
Hello Mr. Breton,
On my website you will find a technical report about the ColorChecker Passport. In this report you will find out about the reformulated N8 patch, four other reformulated patches, and gamma corrected RGB values for the highlight and shadow clipping test patches. The report is at
http://www.rmimaging.com/information/ColorChecker_Passport_Technical_Report.pdf
If you want the spectral data from my ColorChecker Passport, you can get it at
http://www.rmimaging.com/spectral_library/library_index.html
Robin Myers
On Jun 15, 2010, at 6:13 PM, Roger Breton wrote:
> I can be such a laggard, at times.
>
>
>
> Anyway, I just picked up an X-Rite ColorChecker Passport last Sunday, at a
> local photo retail store, and I must say, it is growing on me. Just finished
> measuring the main group of patches, the traditional 24 ColorChecker colors,
> and had a few questions I thought I'd throw the group, in case.
>
>
>
> First, I have the impression that the N9 patch (white) is not as neutral as
> traditionally was in the larger version of the ColorChecker? It could be my
> impression but, measured with a SpectroEye, I'm getting a b* value a little
> above 2 for this patch, where I seem to recall that the N9 patch on the
> larger ColorChecker chart, measured closer to 0 - never had such a large b*
> component, for sure. Since I am pretty confident in my measurement, I was
> curious whether that was X-Rite's real intention to make this patch
> "warmer"? For the record, the four other neutral patches on this target, in
> that bottom row, all register very close to 0 on a* and b*.
>
>
>
> Second, as for naming these 24 colors, I think it's a no-brainer to
> recognize that the first two bottom rows are made up of neutrals and RGBCMY
> colors. On the top row, starting from the left, are the African and
> Caucasian skin colors (same chromaticity, actually, just a change in
> luminance factor, Y), then followed by "blue sky" and "foliage". Then, the
> rest, I'm not sure what name to call these colors, other than their original
> Munsell HVC notations. Would anyone know what natural, real world
> colors/objects the rest of the patches on this chart stand for? I think
> there is an orange, an ochre, a lime green, a lavender and, perhaps, a
> purple color. But I'm not 100% sure of this.
>
>
>
> I still have not explored the patches in the top section of the chart, those
> situated in that top fold out, above the 24 ColorChecker chart. I still have
> to read up on their use and try that Adobe Lightroom Plug-in that is said to
> accompany this chart.
>
>
>
> BTW, I kind of like the format of this chart. I find it convenient to carry.
> Fits perfect in a gadget bag or in my jacket's pocket. And I prefer the size
> of these patches over the ColorChecker Mini.
>
>
>
> So, all in all, I think that's a big thumb up for X-Rite. (I don't work for
> X-Rite but I feel I should give credit where credit is due)
>
>
>
> Thank's in advance for those who are interested in contributing to this
> thread. I'm looking forward to learn all about this chart.
>
>
>
> (please excuse my poor English syntax, here and there)
>
>
>
> Best / Roger
>
>
>
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