Samsung NV20 Service Manual page 74

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Ⅲ. ADJUSTMENT
11. CCD Black Level (OB) Adjustment
A. Purpose
The CCD sensors produce read out data even if there is no light due to their inherent characteristics, and the
image contrast can be affected by the read out data. To compensate for this phenomenon, the CCD has a
lightproof field.
But the CCD sensor area and the lightproof field may have different characteristics. To compensate for the
differences, perform the CCD Black Level (OB: Optical Black) adjustment.As the Black Level depends on the
ISO gain to change, do the Black Level adjustment by using ISO values.
B. Procedures
① Save the adjust12.txt and adjust_t files on the Root directory of the SD card and insert the card.
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