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05/03/2005 05:16:40 PM · #1 |
How do you use a grey card? Like, step by step, what does it do? and how is it used? What is it used for? im so confused.
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05/03/2005 05:37:40 PM · #2 |
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05/03/2005 10:44:30 PM · #3 |
Originally posted by jmlelii:
How do you use a grey card? Like, step by step, what does it do? and how is it used? What is it used for? im so confused. |
A grey Card is just a grey coloured card. It can be used the way you like! |
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05/04/2005 11:23:46 AM · #4 |
Well jokes apart. A Grey Card is the one that reflects about 18% of the light incident to it. It is about the colour that you see (light grey) on the DPC site background.
As you know, a white card reflects almost 90% of the light incident to it, while a Black surface reflects almost NIL (it absorbs all light incident to it).
Most of the subjects that we photograph (landscapes etc.) reflect about one-fifth the light as compared to white surfaces (thats why 18%). To use a grey card, you simply have to position the card, so that the incident light to the card is similar to that on the subject. Record the shutter speed & aperture. Now, even if your subject suggests some different exposure, you can adjust the same as per readings obtained from the Grey-Card. |
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05/04/2005 11:29:22 AM · #5 |
| And to amplify kbhatia's great explanation, grey cards can be expensive because they need to be "neutral", that is, they need to reflect the exact same amounts of red, green and blue. This is more complicated than it sounds, especially ensuring that the card will not experience color shifts with age and use. |
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