pixel adjustment (digital) to fine tune the actual black and white response. The calibration
process occurs under the right side of flatbed image scanner where there is a special white
calibration label.
Calibration is the most important step in creating a high quality image. Calibration problems can
include color inaccuracies, brightness inaccuracies, and vertical streaks through the image. The
calibration process identifies any bad pixels and enables the image formatter to recreate the lost
information from adjacent pixels. Extreme cases of this problem can appear as large vertical
streaks or image smears. The user has no control over the calibration process itself or this pixel-
replacement process.
Copy or scan-to-computer sequence of events
To create an accurate rendition of a document, the scanner must be calibrated for the requested
operation. If the user selects a scan at 600 ppi color, the flatbed image scanner calibrates for that
specific operational mode. Subsequently, the flatbed image scanner automatically re-calibrates for
the next requested operation. Calibration does not occur for every new copy request.
Normal sequence of operation for a flatbed copy or scan includes:
1. LEDs illuminate.
2. Carriage motion begins moving the CIS scanner toward the left.
3. Image capture continues for the entire page or length requested in a scan-to-computer operation.
4. Carriage returns to the home position on the right.
ENWW Scanner system 57
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