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white card white balance Anonymous
i've googled a bit, got a bit of info. i want to know what /p/ knows about the white card white balancing.
how does that work?
in what situations is it nifty to do?

is it, AT ALL necessary?

thanks! pic related
>> Project !dashI8UpO.
It's not exactly necessary. You can get by without one assuming you shoot raw. I imagine it would be useful though for like, indoor sessions like wedding/receptions with off color lighting.

Fun fact: The interior of lowepro bags are close to 18% gray.
>> Anonymous
"18% grey" cards vary a lot more than they should. They can be 12-25 or worse sometimes.
>> Anonymous
different cameras do it in different ways

tell us what kind of camera and we can tell you how to do it
>> Anonymous
>You can get by without one assuming you shoot raw

what do you mean by this? assume i don't have any type of post processing stuff
>> Anonymous
>>277908
If you shoot in your camera's RAW format(assuming that it has one), you can use Photoshop or the software that came with your camera to adjust mostly anything about the image, including white balance.
>> Anonymous
>>277905
i don't need to know how to do it. i just want to know why people do it. what kind of situations warrant it? does it ever become truly necessary for an amateur shooter just trying to get technically clear and correct shots
>> Anonymous
>>277910
1. http://www.kenrockwell.com/nikon/d40/users-guide/index.htm

2. Click on "Printable version of my D40 User's Guide"

3. Go to the white balance section of the appendix.

4. Learn.

5. ?????

6. Profit
>> Anonymous
i have a bad bullshit detector so please no crockwell links
>> Anonymous
assuming you're not trollin, the camera adjusts the rgb values so that certain colors are neutral (white, gray, black) and setting the white balance to a white card will make it so white things will look white, even if the light is colored differently. for example, shooting under incandescent light will make everything look red, and adjusting your white balance compensates by enhancing the blue and green channels.
is it necessary? of course not, but if you are in bad light it will make the colors a lot better.
>> Anonymous
>>277931
I would agree that ken rockwell is an epic troll

however, most people that have an interest in photography can learn lots of stuff from the appendix of the pdf version of his d40 guide.
>> Anonymous
You only need to worry about white balance if you're shooting JPEG or TIFF. Otherwise it's just something to do if your AWB is messing up and you want to chimp in something resembling the final colors.
>> Anonymous
This kind of issue only shows how good RAW is to work with. You can try and patch it up in jpgs after, but with RAW it's not a problem at all.
>> Anonymous
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i use the expodisc, it gets a perfect 18% in every single situation

you just snap it on your lens and take a photo, done. it's expensive (around 100$) but it works
>> Project !dashI8UpO.
If you're really worried about exposure, get an incidental light meter.
>> Anonymous
>>278188
White balance is for colour correctness, not exposure. Film cameras do not use white balance.
>> SAGE
>>278536
well you do have to choose the corect film, eg tungsten film for indoors, and there are correction filters, so it does matter
>> Anonymous
>>278536
Choosing a film is like choosing a white balance.

Most consumer film is daylight balanced.
>> Anonymous
>>278728
true dat

you can get a few different ones for certain kind of lighting, either artificial or daylight
>> Anonymous
>>278536White balance is for colour correctness, not exposure. Film cameras do not use white balance.

umm, okay? did i say anything about exposure?

it's called the expodisc and it gives you 18% gray for a perfect white balance, idiot

and who the fuck said anything about film