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22 | Hardware Reference - Flextight 848 | |
Calibrating the Scanner | ||
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White Calibration for Reflectives
The Flextight scanner uses a white reference to make sure that all elements in the scanner's CCD react consistently to light brightnesses. The scanner has been calibrated from the factory, and the calibration data is stored in the scanner’s flash PROM.
As the scanner ages, the properties of the light tubes may change slightly. Therefore, you must redo the white calibration every six months or so and immediately after changing the light tubes.
Use procedure below to make White Calibration:
1.Find the white calibration sheet that came with your scanner. It is a square white piece of paper (219 x 219 mm (8.6" x 8.6")).
If you have lost the white calibration sheet, then you can use a flat
2.Your scanner came with several clear plastic layers for the reflective original holder. If you have used the reflective holder before, make sure that there are no finger prints or other marks on the plastic layer. Replace the layer with a new one if necessary.
3.Align the top edge of the sheet with the dotted line near the top of the original holder (see Figure 6 opposite). Align each side of the target with the edges of the original holder.
4.Select White Calibration from the Maintenance window. The External White Calibration window appears.
