Re: X-Rite ColorChecker Passport
Re: X-Rite ColorChecker Passport
- Subject: Re: X-Rite ColorChecker Passport
- From: "dpascale" <email@hidden>
- Date: Tue, 15 Jun 2010 21:52:46 -0400
Roger,
For a good average of the standard ColorChecker, you can download all the
data you want here:
http://www.babelcolor.com/main_level/ColorChecker.htm#ColorChecker_data
Danny
----- Original Message -----
From: "Roger Breton" <email@hidden>
To: "colorsync-users" <email@hidden>
Sent: Tuesday, June 15, 2010 9:13 PM
Subject: X-Rite ColorChecker Passport
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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