[Leica] (SPAM: ?) Re: New tutorial on my photo lessons website

[Christopher Crawford]

The American version is still 18% gray. Maybe the old 18% gray cards Kodak
sold in Europe were not neutral, while the American version is. That’s
interesting that they sell different versions in different parts of the
world. I’ll have to change my description to say that the American version
is what I tested.

-- 
Chris Crawford
Fine Art Photography
Fort Wayne, Indiana
260-437-8990

http://www.chriscrawfordphoto.com  My portfolio

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On 2/3/17, 2:22 PM, "LUG on behalf of Eddy Willems"
<lug-bounces+chris=chriscrawfordphoto.com at leica-users.org on behalf of
eddy at altphoto.be> wrote:

>indeed if you speak about the new Kodak gray card R27 which I didn't
>know was on the market and which never have seen in Europe an is 15%
>reflective
>
>
>
>the one we can buy in Europe is the old one 18 %
>here you see the difference
>
>
>
>Op 3/02/17 om 19:53 schreef Christopher Crawford:
>> The Kodak card is supposed to be neutral and usable for white balance.
>>The
>> info sheet that comes with it states that, and shows a spectral response
>> graph showing that as well. I¹ve done numerous tests with it and it
>>gives
>> consistent results in all types of light, though the results are (as I
>> state in my tutorial) very slightly warmer than the results obtained
>>with
>> the other cards.
>>
>> I think the Xrite Colorchecker Passport¹s white balance squares are the
>> very best. The differences between the Colorchecker Passport, Whibal,
>>and
>> Kodak Cards are subtle though. Each of the cards I tried gives slightly
>> different results.
>>
>> On the Colorchecker Passport, Xrite says that you should not use ANY of
>> the white or gray squares on the passport¹s page that had the old
>>Macbeth
>> Colorchecker chart, as these are not truly neutral. Instead, they say to
>> use one of the two white balance pages. One is a large light gray page.
>> The other is on the page opposite the traditional Colorchecker. That
>>page
>> has two lines of white balance squares. One is labeled Portrait, the
>>other
>> Landscape. Each line includes a true neutral square and the several
>> slightly non-neutral squares that allow you to choose a slightly warmer
>> white balance (on the portrait line) or a slightly warmer or cooler
>>white
>> balance (on the landscape line).
>>
>
>
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