[Leica] New tutorial on my photo lessons website

[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).

-- 
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, 1:24 PM, "LUG on behalf of Eddy Willems"
<lug-bounces+chris=chriscrawfordphoto.com at leica-users.org on behalf of
eddy at altphoto.be> wrote:

>there is something wrong on page 2 of your manual
>
>The Kodak Gray card is made to give you 18% gray
>it is I think the only card on the market today that gives you the
>perfect 18% gray
>it is a card the measure the light
>because all light-meters used to be calibrated on this 18 % gray
>but the kodak gray card doesn't reflect all the colors in the same amount
>that's why they made digital gray cards
>these are not meant to meter the exposure
>the name is wrong we better cal these white balance cards
>it is always better to use one that's not grey
>the WhiBal G7 in your collection is the best
>
>when you use the ccp they advise you to use the the second path on the
>white side of the bw strip
>
>I teach photography and every year when I explain the difference between
>exposure metering and white balancing
>I ask the students to put their gray cards on the table
>then you see a big difference between them, you even see big differences
>between cards from the same manufacturer.
>
>white balance metering is also different as exposure metering, you have
>to hold the card different
>
>and color temperature metering without camera calibration is only half
>the story
>
>best regards
>
>
>
>Op 2/02/17 om 23:09 schreef Christopher Crawford:
>> I have just added a new tutorial to my Photo Lessons website!
>>
>> White Balance Demystified
>> <http://crawfordphotoschool.com/digital/whitebalance/index.php>
>>
>
>
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