Panasonic DVC20 Explanation of terms, Automatic white balance, White balance, Auto focus

DVC20_Eng.book 38 ページ ２００５年１０月３１日 月曜日 午前１０時３６分

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Explanation of terms

ªAutomatic white balance

White balance adjustment recognizes the color of light and adjusts so the white color will become a pure white. The camera-recorder determines the hue of light that comes through the lens and white balance sensor, thereby judging the recording condition, and selects the closest hue setting. This is called automatic white balance adjustment. However, since the camera-recorder only stores white color information under several light sources, automatic white balance adjustment does not function normally under the other light sources.

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Outside of the effective range of automatic white balance adjustment, the image will become reddish or bluish. Even within the effective range of automatic white balance adjustment, the automatic white balance adjustment may not function properly if there is more than one light source. For light outside the functional auto white balance adjustment range, use the manual white balance adjustment mode.

1)The effective range of automatic white balance adjustment on this camera-recorder

2)Blue sky

3)TV screen

4)Cloudy sky (rain)

5)Sunlight

6)White fluorescent lamp

7)2 hours after sunrise or before sunset

8)1 hour after sunrise or before sunset

9)Halogen light bulb

10)Incandescent light bulb

11)Sunrise or sunset

12)Candlelight

ªWhite balance

The image recorded by the camera-recorder may become bluish or reddish under the influence of light sources. To avoid such phenomena, adjust the white balance.

White balance adjustment determines the white color under different light sources. By recognizing which is the white color under sunlight and which is the white color under a fluorescent lamp, the camera-recorder can adjust the balance among the other colors.

Since white color is the reference of all colors (light), the camera-recorder can record pictures in a natural hue if it can recognize the reference white color.

ªAuto focus

Auto focus automatically moves the focusing lens forward and backward inside the camera-recorder to bring the subject into focus.

Auto focus has the following characteristics

≥Adjusts so that the vertical lines of a subject are seen more clearly.

≥Attempts to bring an object with higher contrast into focus. ≥Focuses on the screen center only.

Due to these characteristics, auto focus does not work correctly in the following situations. Record pictures in the manual focus mode.

Recording a subject with one end located closer to the camera-recorder and the other end farther away from it

≥As auto focus adjusts at the center of an image, it may be impossible to focus on a subject that is located in both the foreground and background.

Recording a subject behind dirty or dusty glass

≥The subject behind the glass will not be focused because the focus is on the dirty glass.

Recording a subject that is surrounded by objects with glossy surfaces or by highly reflective objects

≥The recording subject may become blurry because the camera-recorder focuses on the objects with glossy surfaces or on highly reflective objects.

Recording a subject in dark surroundings

≥The camera-recorder cannot focus correctly because the light information that comes through the lens decreases considerably.

Recording a fast-moving subject

≥As the focus lens-inside moves mechanically, it cannot keep up with a fast-moving subject.

Recording a subject with little contrast

≥A subject with little contrast, such as a white wall, may become blurry because the camera-recorder achieves focus based upon the vertical lines of an image.

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