On Tue, 15 Nov 2011 18:47:38 -0800, Savageduck
<savageduck1@{REMOVESPAM}me.com> wrote:
>On 2011-11-15 17:34:37 -0800, PeterN <> said:
>
>> On 11/15/2011 6:22 PM, Savageduck wrote:
>>> On 2011-11-15 14:07:22 -0800, PeterN <> said:
>>>
>>>> On 11/15/2011 3:54 PM, Savageduck wrote:
>>>>> On 2011-11-15 12:41:39 -0800, tony cooper <>
>>>>> said:
>>>>>
>>>>>> On Tue, 15 Nov 2011 10:28:27 -0800, Savageduck
>>>>>> <savageduck1@{REMOVESPAM}me.com> wrote:
>>>>>>
>>>>>>> That is his argument, that most grey references were intended for
>>>>>>> You are adjusting WB not exposure. Shoot with whatever exposure
>>>>>>> compensation your illumination requires. It is color temperature, not
>>>>>>> exposure which should be the concern.
>>>>>>>
>>>>>>> The older WhiBal cards included a darker grey for JPEG WB & exposure
>>>>>>> adjustment (JPEG WB adjustment is always going to be subjective and
>>>>>>> not
>>>>>>> particularly exact).
>>>>>>> The current WhiBal cards ( I have two one credit card sized and one
>>>>>>> larger 6 x 3.5 card) only have the calibrated grey for RAW WB
>>>>>>> adjustment along with a "black point" & "white point" target and a
>>>>>>> contrast target.
>>>>>>
>>>>>> I have - and use - a WhiBal card from Michael Tapes, but I don't use
>>>>>> it prior to set a custom white balance. I use it for table-top
>>>>>> photography where I'm using external lighting. I take one shot with
>>>>>> the card in the image, and then the next shots without the card. All
>>>>>> shots are done with a fixed aperture and speed setting (M).
>>>>>>
>>>>>> When I process the image, I use Photoshop Curves and use the white,
>>>>>> black, and gray points on the card to set the curve, save that curve,
>>>>>> and apply it to subsequent shots done under the same lights.
>>>>>>
>>>>>> Most of the time, it works a treat. Sometimes, though, it's really
>>>>>> off. In those cases, I set the curve manually and save that.
>>>>>
>>>>> Using that method is OK for JPEGs sometimes, but is always susceptible
>>>>> to lighting quirks, and as you said you are setting an adjustment curve
>>>>> using the white, black, & grey points, that is not setting the WB for
>>>>> the JPEG after the fact. Trying to fix WB in a JPEG is always going to
>>>>> be an eye-ball kludge.
>>>>>
>>>>> Using your RAW, or DNG files and your WhiBAl card grey target for
>>>>> setting WB in Lightroom or ACR is going to give you a much better
>>>>> result.
>>>>>
>>>>
>>>> You can easily set WB in PS.
>>>>
>>>> Duplicate the layer.
>>>> Filter | Blur | average
>>>> create a levels layer
>>>> touch the middle pointer to the blurred image
>>>> that will set layers to neutral gray.
>>>> delete the blurred layer
>>>> your image will be color corrected.
>>>
>>> Why bother with all that tedium? You are setting WB as a starting point
>>> for post processing, not color balancing, or exposure compensating
>>> All I do is, at some point in shooting a series of shots, is to place
>>> the WhiBal card in the scene under the working illumination and take a
>>> shot.
>>>
>>> Then in ACR I use the WB tool to set the WB without making any other
>>> adjustments. Click on "Done" in ACR. Then in Bridge I select all of the
>>> other images taken under the same conditions and apply the "previous
>>> correction". Now each of those has the custom WB set and I can go ahead
>>> and open all of those individually or as a batch in ACR, and I do not
>>> have to worry about WB settings.
>>>
>>> Here is a basic set up. In these two cases the background color efects
>>> the WB in the scene. On the Left is the uncorrected NEF, on the Right
>>> the WB corrected image, having used the WhiBal grey target in ACR.
>>> < http://homepage.mac.com/lco/filechute/WB%20compW.jpg >
>>>
>>>
>>
>> That method is fine if you enjoy carrying an extra thing. Also it will
>> not remove color casts when you are shooting animals through glass in a
>> zoo.
>
>Carrying an "extra thing" is not an issue. I can hang it around my neck
>by the lanyard, or I can slip it into a shirt pocket.
>There is no problem getting a reference shot in any series of shots,
>before, after, or during. I can just hold the card out at arms length
>and take a reference shot, like so.
>< p://homepage.mac.com/lco/filechute/WB-Comp-02.jpg >
I do carry my WhiBal card in my camera bag. When I was at the Gay
Pride Rally, though, I wasn't about to ask the people I photographed
if they'd hold up the card for the first shot for me. I've used the
card in the field less than half a dozen times in the last two years.
I find white balance to be a very, very minor problem 95% of the time.
It's usually correctable in post processing if it is a problem.
The only time it concerns me is shooting under artificial lighting
from more than one type of light, and when there is a series involved
and the colors have to be true throughout the series. In this
situation, I shoot the card and set up a curve to use on all the
shots.
>Personally, shooting zoo animals, indoors, through glass, are not
>subjects I would deliberately seek out.
I don't think anyone deliberately seeks out subjects that are
problems. What we do is deal with problems that arise with subjects
we stumble on that are good photographic material.
--
Tony Cooper - Orlando, Florida