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Posted by Gene E. Bloch on 04/06/07 23:27
"AnthonyR." <nospam@sorryspammers.com> wrote in
news:46152706.3000301@sorryspammers.com:
> Richard Amirault wrote:
>> "Gene E. Bloch" wrote ...
>>> I would be willing to bet (OK, maybe only a nickel) that your
>>> camcorder has custom white balance, but I'm too lazy right now
>>> to download the manual and find out for myself.
>>>
>>> Although that's not called manual, it does give a comparable
>>> capability.
>>
>> I have a Sony Digital 8 that *only* has automatic color balance.
>> My Sony Mini-DV has adjustable white balance.
>>
>> For the original poster ... What kind of circumstances are you
>> shootiing? What is the color of the subject? What is the color of
>> the background? What kind of room? Daytime? Nighttime? Windows?
>> Are the lightbulbs all the same type (mixed incandesant /
>> flourescant?)
>>
>
> Richard, when you say the camera has automatic white balance, what
> do you mean? How does it balance it? How do you tell it what is
> white? And if it's automatic, how does it do it?
> Usually, every camera I've ever owned even the cheapest, let's you
> point to a white object and hit a button so it can adjust to that
> being white.
>
> Does your manual in the Sony Digital 8 explain how it can possible
> determine a white subject on it's own (automatically)?
> It might have settings for daylight, tungsten, florescent etc...I
> can understand that, but auto, how?
>
> AnthonyR.
>
How about the simple way? Find out the average color of the scene,
assume that that average corresponds more or less to white - or
grey, which is a dirty white :-) - and choose a balance that makes
that average color look white.
This amounts to adjusting the gain of two of the colors so that
their average intensity equals that of the other color. Let us say,
adjust the levels of red and blue to match that of green.
--
Gene E. Bloch (Gino) ... letters617blochg3251
(replace the numbers by "at" and "dotcom")
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