A gray card is an object of neutral color which
reflects a certain amount of light. It is used
to solve two color related problems in photography.
One problem is a so called color cast (~ hue tint) in
images caused by different illumination conditions
and the cameras (in)ability to neutralize it. The
other problem is the lack of a reference point for
managing exposure time (amount of light captured),
to prevent an image turn out too dark or light.
There are several good reasons to buy a professional
gray card but if you are in a hurry or want to
experiment you can also print a gray card first.
Consult your camera's manual ("manual white balance" and
"exposure time") for instructions on how to use a gray
card.
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Description
|
RGB Value
|
Lab Value
|
Link
|
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12% Gray Card
|
31.37% / 80
|
34%
|
Download *
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12% Gray Card
|
33.33% / 85
|
36%
|
Download *
|
|
18% Gray Card
|
47% / 119
|
50%
|
Download *
|
|
18% Gray Card
|
50% / 128
|
54%
|
Download *
|
|
90% Gray Card
|
93.33% / 238
|
94%
|
Download *
|
|
Post Processing
|
multiple
|
multiple
|
Download *
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* Please don't link these files directly. Link to this page instead.
