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kodak neutral test card

Also known as the Gray card, a Kodak neutral test card is an 8 X 10 (20 cm by 25.5 cm) card, about 1/8 thick, that is uniformly gray on one side. The gray side reflects precisely 18% of the white light that strikes it (corresponding to the calibration of a reflected-light meter). It is uniformly white on the other side, which reflects 90% of the light.

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kodak neutral test card

Compared to BH perforations, larger in size, and with rounded corners for extra strength. Used primarily for release prints.
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kodak neutral test card

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