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5-1-3. Handling the Grayscale Chart
It is preferable to use an 89.9%-reflective grayscale chart for electrical adjustments.
If a reflective chart is not available, use a calibrated pattern box and a transparent grayscale chart for adjustments.
Before beginning adjustment, set the illumination of the light source (or the luminous intensity on the chart surface) properly
proceeding as follows and set the color temperature to 3200 K exactly by adjusting light.
Information on the reflective grayscale chart (16:9)
Recommended chart
The reflective grayscale chart (16:9) is commercially available.
•
Product name: Reflective grayscale chart
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Supplier: MURAKAMI COLOR RESEARCH LABORATORY
Handling precaution
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Do not touch the chart's surface with bare hands.
•
Do not subject the surface to dirt or scratches.
•
Do not prolonged exposure to sunlight.
•
Protect the chart from excessive moisture or harmful gas.
•
Avoid resting articles against the case.
•
When the chart is not used for a long period and is stored, open the case and dry the chart for about 30 minutes to an hour once
or twice a month.
Setting Illumination
Measuring equipment: Illuminance meter (Calibrated)
Procedure
1.
Turn on the light source.
2.
Warm up the light source for about 30 minutes.
3.
Place the illuminance meter on the chart surface.
4.
Adjust the position and angle of the light source so that the whole surface of the chart is evenly 2000 lx.
Note
Light the chart from almost the same direction and height as the camera to shoot the chart.
Chart
Illuminance meter
Light source
70
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