Gray Card
Friday, April 29th, 2011 |
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 Canon PowerShot SD1200 IS digital camera + 4gb memory card charger box cd papers $50.00 (23 Bids) Time Remaining: 7h 7m |
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Gray Card
How Can A Boring Piece Of Gray Card Improve Colour Photography?
When taking digital photographs, a grey card can be an important accessory in creating white balance and getting precise representation of colour. A digital camera will record the colour of light very accurately. The eye and brain are extremely adaptable to variations; digital is not, it records what is there. Something might look white to us, but if it has a colour cast, that will show on the digital file.
By using a grey card, the camera can be set to a true white balance, resulting in a more accurate recording of all the colours. This is particularly important when there is mixed light from different sources. There might be a mixture of daylight and tungsten and even a bit of fluorescent thrown in.
A grey card is a piece of card which is grey. These days, they are often made of a more durable material than card but they will be a neutral grey. The older photographic grey cards are not suitable because they are not neutral enough. They were used for judging exposure rather than judging a white balance and colour neutrality.
Photographic grey cards have a reflective surface of 18%. Digital grey cards usually have a reflective surface of 18% or 25%. That doesn't matter; what does matter is their accuracy, they must be neutral grey.
The grey card is put into the image so that the light falling on the subject also falls on the grey card. The white balance reading is taken from the card. The photograph should be taken in Raw and not as a JPEG in camera.
Short of using a proper copying bench with flash or tungsten lighting, then the best way to photograph a painting is outside. Choose a bright day with diffused light, and be out of direct sunlight. The only way to make an accurate white balance is to use a grey card.
Some samples of the grey card have a true white, an 18% grey and a black. Setting the image to these tones will give as accurate interpretation of the colours as possible. Without a grey card there is no chance of getting the colours of the paints looking like the originals.
Where lighting conditions are completely controllable, such in a studio, a grey card is still an essential gadget. Exposure and colour balance need to be consistent in every image. Relying on the camera's automatic reading of the conditions means that when the subject is changed, the readings will change. With a grey card, the digital photographer can take a specific reading from a single target point and the resulting settings for the white balance will be good for all the images in that lighting, even when the subject matter is changed.
Two objects might look the same colour in one type of light, but can look different colours in a different light source. For example, a matching scarf and handbag might look different colours in a second type of light. This is due to the amount of ultra-violet light the objects absorb and reflect. Using the grey card can help minimize the problems here.
The Cube takes the grey card to a more precise level.
The six sides of the cube are black, white and grey; but it also has other features.
A Cube is particularly useful in a studio environment.
• The top chrome ball will catch specular highlights which is an extreme highlight containing no detail.
• The white face is the brightest highlight still retaining useful detail.
• The grey face is an 18% grey for setting mid-tone neutrality and colour temperature.
• The black face is for the shadow, still retaining some shadow detail.
• The black hole, referred to as the Black Trap, is an absolute black and is used as a reference point for the black face.
More on the Cube and the Gray Card, including sources, can be found at ---->
The Gray Card
About the Author
Duncan Wherrett is an experienced professional photographer and Photoshop instructor. Great information and masses of tips on Photoshop via: ---->Photoshop In A Day
Where can I get grey card?
I've been reading up on metering techniques and greycard comes into it a lot. No photo labs or camera shops sell it. Do I need to contact a pro photography equipment supplier? Or is it ok to buy some ordinary grey card from a bookstore?
You need to ask about the grey cards, most camera shops do sell them. At least the one's where I live do. Don't just buy a piece of grey stationary, what's important about the grey card is that it is 18% grey, which makes it a specific grey and not an ordinary grey (though ordinary may work for you anyway). To tell you the truth, I don't think it matters much. I've shot my custom WB from both an 18 grey and some nice asphalt and got the same results. The key is having a good midtone to work from, especially when dealing with tricky metering and WB. Some use them, some dont. I don't. Now, I don't doubt you couldn't find one at a photolab because they don't have much to do with cameras (only the finished pictures), a place like Wolf may not be advanced enough, but you should have several camera shops around your area that do, you just have to ask someone.
Can I Use an 18% Gray Card Instead of White for White Balance?