the image on scans and copies. It reports a scanner error 6 message if the reference features are
not found.
●
Calibration. This test, also known as scanner color calibration, enables the product to identify
the black and white on every pixel in the CCD. Calibration occurs in two major processes: a
broad (analog) adjustment of all pixels to bring them into the target output range, and a pixel-by-
pixel adjustment (digital) to fine tune the actual black and white response. The calibration process
occurs under the left 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 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 job includes the following.
1. LEDs illuminate.
2. Carriage motion begins moving the CIS scanner toward the right.
3. Image capture continues for the entire page or length requested in a scan operation.
4. Carriage returns to the home position on the left.
ENWW
Scanning/image capture system
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