Gray Card
The 18% Gray Card has several uses. It can be used to determine the correct exposure (hence the 18% bit) and can also be used in a couple of different ways to help set up the correct color balance for the shot.
Exposure ...
Gray card
A card with an 18 percent gray tint (reflectance) used to determine exposure by taking a meter reading from subject light reflected by the card.
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Gray cards are used, together with reflective light meters, as a way to produce consistent images in film and photography.
Where do you get a gray card? There's one in the Kodak Professional Photo Guide, a valuable guidebook that sells for about $32. Or you can buy a Kodak gray-card by itself for $14.95 at your local camera store.
For this reason, many photographers make use of a standard gray card instead. When you think about it, it makes perfect sense. It has a nice, medium tone and a neutral hue, and photographers frequently have one anyway for metering.
Gray Card
Gray Card (18%) is a reference tonal value of gray that represents "middle gray" on the grayscale. The Gray Card is used a standard in photography to establish consistent exposure and color value representation.
Gray Cards which are medium tone.
Luckily there are many middletone subjects so you can trust your camera when photographing middletone with good results, otherwise you need to make changes.
GRAY CARD - Also known as the "Kodak neutral test card," a gray card is an 8" X 10" (20 cm by 25.5 cm) card, about 1/8" thick, that is uniformly gray on one side.
Gray Card Balanced in RAW Converter VS. Custom White Balance with Expo Disc
WhiBal Gray Card - white balanced in Capture One
white refrigerator = 232R-234R-235B
3 points blue ...
Gray card. A card that reflect a known percentage of the light falling on it. Often has a gray side reflecting 18 percent and a white side reflecting 90 percent of the light.
Gray card. A piece of cardboard or other material with a standardized 18-percent reflectance. Gray cards can be used as a reference for determining correct exposure or white balance.
Gray Card
A Matte 18% reflectance card used instead of a subject for a Reflected Light Meter reading. Tips: Exposure corrections for unusually light or dark subjects are the same as for an ILM - not an RLM.
Gray Cards
Since the exposure system is designed to set the exposure to capture a middle gray scene, you can get perfect exposures by using a gray card.
Gray Card - Gray cardboard that is used to establish the base-line exposure reading when using reflecting-light meters.
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I cut a gray cardboard (2) in the dimensions of my photograph, placed it between the softbox (1) and the object, and illuminated it separately (10). As a result, I got a perfect contour all around the chrome tap.
Use a gray card when you are in tricky lighting situations. You might think that this technique would work well with brides, but not with bears. Not so.
Figure 2: Gray Card
To perform a custom white balance, both images are opened in the Photoshop. The images are arranged in a way that both can be seen (see Figure 3).
Figure 3: Both Images Opened in the Image Editing Program ...
Adorama / Delta Gray Cards Exposure Aid, Pack Of Two (2)
$11.95
Lastolite EzyBalance Grey/White Card 12" (30.5cm) Exposure Aid Card - Water proof - Scuba Capable ...
Theoretically, if you take a reflected-exposure meter reading from an 18-percent gray card and expose your film according to the reading, the result should be a picture that matches the tone of the gray card exactly; however, ...
The Zeltsman Approach to Formal Classic Portraiture Learning Photography DOF Preview and the Gray Card Walk. Random unsorted
Mark Williams' Site He found my site while searching for info on the Sony Wide Angle Conversion lens.
- Substitute Reading: Take an alternate meter reading off a middle tone - blue sky, gray card (sold in camera stores), or any medium-colored object. Simply point your camera at, say, the blue sky, fill up your viewfinder with that tone.
For pinpoint exposure, however, we recommend that you use a gray card or take an incident reading. (These alternate methods have previously been explained on this site.
By pointing the camera at a white or gray card (angled so that it is reflecting light from the room) as a neutral reference, filling the screen completely with it, then pressing the White Balance button (or set it in the menu), ...
All cameras used manual white balance measured from a gray card
All cameras exposure compensation was set to produce the same image histogram*
All other image parameters (sharpening etc.) were set to normal (neutral setting) ...
The correct exposure value can also be read off a neutral test card or 18 percent gray card (or even the palm of the human hand) held in front of the subject.
Calculating a custom white balance using a gray card or other neutral target is ideal, ...
While an 18% gray card would be a start to dial in the midtones, a series of gray patches would be better (highlights, midtones and shadows.
Mennon Set of 2 Gray Card's size 6″x8″ and 8″x10″, 18% Gray / 92% White
Adorama Filter Wrench. Set of 2. Fits 46-58mm Filters
Opteka RC-4 Wireless Remote Control for Canon EOS Digital SLRs ...
You don't want to meter the subject, or that would bring out more detail. Try to find a midtone area, such as the moderate shadows, or use a gray card, which is a simple piece of cardstock that has average "reflectivity." ...
is how to get a generic exposure (just avoiding under and over exposure overall). this will not get you a subject accurate exposure it will just give you an overall gray tone exposure as will every in viewfinder metering not taken off of a gray card.
 See also: Gray, Light, Card, Photograph, Camera
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