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a gray cards is used to determine the correct exposure or white balance before or during shooting

learn more… | top users | synonyms

22
votes
4answers
8k 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?
22
votes
10answers
8k views

What is the 18% gray tone, and how do I make a 18% gray card in Photoshop?

I have heard about 18% gray tone — what is it really, and why 18% (and not 20% or some other value), and how can I make it in Photoshop?
16
votes
6answers
5k 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 ...
14
votes
1answer
374 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 ...
14
votes
6answers
9k views

How could one make a DIY Gray card for exposure/color correction?

I know that there are "gray cards" sold that help with exposure/color correction, but as I'm on a tight budget I'd like to make my own. Is this possible? Also, are there other objects (paint sample ...
6
votes
4answers
1k views

How do I get a meter reading for a DSLR without a gray card?

I read an article called Expose (to the) Right, which explained why you should try to get the graph of the histogram as much to the right of the scale as possible. The reasoning is that DSLRs record ...
13
votes
2answers
11k views

How can color temperature be measured using a digital camera?

I know that one can photograph a color-neutral card (white, gray, black) and use it for white balance, either in-camera or in post-processing. Using an image of a color-neutral card taken under given ...
30
votes
6answers
5k views

Why is 18% grey considered to be in the middle for photography?

I heard someone (a photographer) say recently that 18% grey is half way between black and white, not 50%. This seemed a bit illogical to me, and when I asked her why, she said she didn't know. After ...
14
votes
5answers
1k views

What's a good ad-hoc replacement for a gray card?

I know that a real gray card is the best thing to use to determine exposure. But I'd like to know if there are other naturally available features that can be used in a quick and dirty way. Are fields ...
1
vote
3answers
129 views

How do you use a gray card…in the dark room?

Similar to this question; however, I'd like to know more information about using a gray card in a dark room. I know that I am supposed to balance off of it; however, after I make a test strip, how do ...
4
votes
2answers
237 views

How can several gray card shots help with metamerism?

In a comment to my answer on gray card angles, @underarock mentioned having used several gray card shots at different angles to cope better with metamerism. This sounds intriguing, but I'm still not ...