Gray Cards

A tool that allows a photographer to produce a consistent image exposure of a given scene is called Gray Card. It is a flat object of a neutral gray color. It generally consisting a piece of matte cardboard colored gray, where it derives its name. This equipment is uncomplicated and non-mechanized. Being flat as it is, makes the condition more effective than simply being neutral. Being flat ensures that the card appears more balance under any illuminant.

The dimensions of the card is a about 8 X 10 and a 4 X 5 card with an eighteen percentage of reflectance across the visible spectrum and white reverse side which has 90 percent reflectance value. When positioned in a prospect, grey cards become an indicator showing the amount of the exposed part of the photograph. In the same way, it can also be placed within a frame to balance the color.

The major use of gray cards is to give a standard reference point for exposure determination in photography. In addition, it provides a handy reference for white balance or color balance allowing the camera to balance for the illuminanion in a picture.

When you are not sure how to work your camera’s exposure gauge, gray card can help you determine the scene’s quantity of light. Use the gray card as vertical as possible to obtain the most accurate amount of light.

Some situations may require the use of gray card includes:
• a view with backlights or bright lights
• a view with dark central objects and dark tones
• a view with light central objects and light tones

Posted 2010-11-08 and updated on Nov 08, 2010 12:22am by imcarms

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