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Zoom System and Color  

2011-06-29 14:14:21|  分类: 基础知识 |  标签: |举报 |字号 订阅

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Zoom System is used as a standard manual metering method by me. However, I'm quite confused for different zooms in a colorful scene. The following words clarify the relationship between gray scale and color, which can be used for acurate metering for various colors. -- Anthony.

The top row contains zones 1, 3, 5, 7 and 9. Tonal values are compressed in the monitor display and print. (The tonal range is 5, rather than 8, zones.). The second row contains dark colors, the third contains pure primaries (R,Y,G,C,B,M), and the fourth contains pastels. HTML color names are shown in brackets [...]. In some cases they differ from conventional names.

This chart is fairly simple to use. If you are metering off a surface that subjectively resembles one of the colors, make the exposure adjustment (relative zone 5) shown on the right. For example, if you are metering off a pure yellow surface, increase the exposure by 1? f-stops above the meter reading (zone 5), i.e., place it at zone 6?. The values on the chart are accurate to about ±?.



Use the chart for a rough estimate of how to meter off bright colors in the field. Note that the subtractive primaries (Y, C, M) are lighter than the additive primaries (R = Y + M; G = Y + C; B = C + M). Green as we perceive it in nature (typical leaves and grass) is generally darker than spectrally pure green (early spring foliage). Blue as we perceive it in nature (except for rare deep blue skies in mountains above 3,000 meters) is generally lighter (and closer to cyan) than spectrally pure blue— much lighter for typical "blue" skies.
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