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by Aditya

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1
vote
2answers
133 views

Is a 18% gray card intended for exposure metering, and its use to set white-balance is just a bonus? [duplicate]

I've heard that 18% gray cards are intended specifically to aid on determining the right exposure for photography, and only coincidentally for white balance. Is this true? Is it better to use a ...
1
vote
1answer
272 views

How to use a Kodak Gray Scale to color-proof image scans?

I am familiar with the usage of a (Kodak) Gray Scale card when photographing, e.g. to get a color-proof replica of a painting. Now, I'd like to use such a card to ensure my scans are color-proof. At ...
1
vote
2answers
636 views

How does one use a white balance card (gray card) to set a custom white balance? [duplicate]

I have only been able to find instructions that involve post-processing. Is there a process where I can take a photo of the card and set that white balance and save it for my photos? Basically setting ...
5
votes
1answer
135 views

Using gray/white card to determine white balance, does it matter where I stand when I take reading photo?

If I want to use a white card to determine the white balance, and I'm taking a picture of something that is a short distance away from me, does it matter if I don't walk back to where I'm going to ...
4
votes
2answers
205 views

How can I adjust for any inaccuracy in a homemade white card?

Quite a number of years ago, I made my own white card. It is basically made up by two white access cards in plastic glued together and sanded down so that they have a matte finish. The cards have ...
6
votes
2answers
130 views

Can I cut up a 15x20cm Novoflex Graycard without ruining its properties?

I purchased a graycard, specifically a Novoflex 15x20cm (~ 6x8") card that is white on one side and 18%? gray on the other side. However, it's a bit too large to comfortably fit into jacket pocket or ...
14
votes
1answer
303 views

Gray card angle during custom white balance calibration - does it matter?

Do I have to have the gray card on a specific angle while taking a photo for custom white balance calibration? Or it is irrelevant? I am guessing that the gray card plane should be perpendicular (90 ...
8
votes
1answer
125 views

Should I reuse a custom white balance for the same scene but with a different lens?

Let's say I'm shooting from a tripod to an exact spot, I set a custom white balance with a gray card and then I switch lens. Should I redo the custom white balance?
7
votes
2answers
289 views

White balance adjustment using gray card

I need some advice regarding white balance adjustment. I was using a gray card when shooting a series of photos in a forest, because I found the light a bit tricky there. The plan was to set the ...
5
votes
2answers
234 views

Should I be warming grey card calibrated shots?

In a recent blog post at this site, Tim Grey recommended the following: You could then use the white balance tool in Lightroom or Adobe Camera Raw (or similar tools in other software) to make ...
12
votes
6answers
1k views

Why are greycards used for white balance?

I know 18% grey cards are supposed to provide a neutral color to set custom white balance. But why are grey cards used instead of pure white ones? My assumptions: Is a specific greytone easier to ...
18
votes
4answers
5k views

How do you use a gray card?

There are already two questions on how to make a gray card, but unfortunately my ignorance goes deeper than that. How do you use a gray card?