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Differences between White and Grey card
So white card is for white blance and grey card is for exposure right? However, somtimes when I set the white balance using a white card, the image will turn brighter/dimmer, does this means changing the white balance will also affect the exposure? I'm a bit confuse...

Comments (8)

Of course it matters. You're asking how your camera works..

FYI, a gray card will work just fine for setting white balance...

Comment #1

Because you don't need something white to set white balance, you just need something that isn't coloured..

Regards,.

Steve..

Comment #2

Ew>So white card is for white blance and grey card is for exposure right?<.

Yeah but... you can also use the grey card to set white balance..

About exposure and the grey card: the idea is that you set the camera's shuttr speed and aperture (and ISO) to give you a "middle" exposure that matches the grey card. Then anything in real life lighter than grey will turn out lighter than this grey, and anything darker in real life will turn out darker..

If you pointd the meter at a white card instead, the camera would set itself so anything in real ife that was white would turn out grey. That's why you see so many pictures of snow or of white beaches in Florida that turn out grey in the pictures..

About white, or grey, and white balance..

He idea of setting white balance is to have the camera take a picture that will turn out to not be yellow or blue or green, where it is supposed to be white. It turns out that a perfect grey is easy to see in a shot, and you can tell if that grey is not perfect but is yellow or blue, etc. So either white or grey gives you a nice neutral image..

If you used ivory paper, everything white would turn out ivory..

Does this help?.

BAK..

Comment #3

BAK wrote:.

If you used ivory paper, everything white would turn out ivory..

If you use Ivory coloured paper to set your white balance the camera will compensate as necessary to make the paper appear white. Everything will end up looking somewhat blue..

Regards, John..

Comment #4

The correction is correct..

Ivory originals lose some yellow, turning out white. And white originals lose some yellow, moving them towards blue..

BAK..

Comment #5

Q: What's the difference between white and gray sides of a gray card?A: About 2 and 1/3 stops..

The white side has a reflectance of 0.9. The gray side has a reflectance of 0.18. log(0.9/0.18)/log(2) =~ 2.3Take a picture of the gray card, overexposed by 2.3 stops - it will look white.Take a picture of the white card, underexposed by 2.3 stops - it will look gray...

Comment #6

Wilf wrote:.

So white card is for white blance and grey card is for exposureright? However, somtimes when I set the white balance using a whitecard, the image will turn brighter/dimmer, does this means changingthe white balance will also affect the exposure? I'm a bit confuse..

Good question..

And good answers..

This is very helpful and something I often wondered when I first started taking photography seriously (since summer last year)...

Comment #7

Shouldn't we use a piece or white ertalon or something to get a nice white balance ?

Comment #8

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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