18% gray chart reflectance test chart with grey color to replace KODAK Gray Card for camera white balance
KODAK Gray Card / R-27 incorporates the worldrenowned MunSell 18% Reflectance (Gray) Neutral Patch. The catalog number and list price remain the same as the current KODAK Gray Card / R-27; however, the component packaging was reduced to ensure KODAK could provide a higher quality target and maintain the same list price. The new KODAK Gray Card / R-27 incorporates One 4 x 5 in. (10 x 13 cm) Gray Card, One 8 x 10 in. (20 x 25 cm) Gray Card, as well as Instructions for Use.
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.
| Description | RGB Value | Lab Value |
| 12% Gray Card | 31.37% / 80 | 34% |
| 12% Gray Card | 33.33% / 85 | 36% |
| 18% Gray Card | 47% / 119 | 50% |
| 18% Gray Card | 50% / 128 | 54% |
| 90% Gray Card | 93.33% / 238 | 94% |
| Post Processing | multiple | multiple |
