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Old Jan 16, 2004, 6:35 PM   #1
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Default gray card for b-ball game?????

i have heard of people useing gray cards at high school b-ball games to set their wb
has any one done this?
does it help?


thanks,
brad
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Old Jan 16, 2004, 7:07 PM   #2
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Absolutley , works well, Ive got in the habit of doing it all the time.
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Old Jan 16, 2004, 8:16 PM   #3
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what do you recomend for the "gray card" , will constuction paper work, or does it have to be something else?
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Old Jan 16, 2004, 10:13 PM   #4
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Might work, might not. If the paper has a color cast it will result in your images having a complimentary cast. It shouldn't matter if the paper is almost white or almost black so long as all the RGB values are the same.

Experiment with some different "gray" papers and find out if you come close enough to suit your needs. When you do some test shots, put your "gray" reference is in the photo as well.

I thinkyou will find it interesting if you use some colored paper as your "gray" reference.
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Old Jan 17, 2004, 1:38 AM   #5
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This question may sound absolutely 'stupid' but...How do you use a grey(or colored) paper to set white balance. The exact steps if anyone has the time or inclination.

Thanks, Kayd
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Old Jan 17, 2004, 1:51 AM   #6
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If your camera alows manual white balance, you point the camera at a white (or gray) card and push some button(s).
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Old Jan 17, 2004, 3:34 AM   #7
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Quote:
what do you recomend for the "gray card"
Kodak makes gray cards! You can buy them many places!
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Old Jan 17, 2004, 5:14 AM   #8
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A grey card is used to set the exposure (remember incidence vs reflected), NOT the white balance!

To set the White Balance use a white sheet of paper or white plastic covering over the lens (some video cameras come with it as lens cap). Check the camera manual... Each camera has its own procedure for WB, for example like on the 10D or Digital Rebel you can actually store multiple pictures as references and recall them at will (such as a white sheet of paper shot in different rooms with different lightings).
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Old Jan 17, 2004, 5:56 AM   #9
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...or shoot in RAW and do the job back home!
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Old Jan 17, 2004, 8:30 AM   #10
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Quote:
Originally Posted by NHL
A grey card is used to set the exposure (remember incidence vs reflected), NOT the white balance! ...
I suspect a gray card will work just fine to set the white balance for most camera: it will just think the light level is much lower than it really is. The important issue is that the R,G,B values be equal and non zero. The higher those RGB values are, the lower light level it can be used in to set the white balance. Otherwise, I cannot see what the difference would be between a white card and a gray card for white balance.
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