what is calibration in world card colour scannerthis scanner

Dear sir,
               i have a world card color scanner , after installation when i press scan option in outlook or in  it asks for  calibration in this scanner , what is calibration ? kindly advice and how should i do it. in the manual it says that we have to insert a plain card in the scanner for calibration , can we insert any plain card or it is any spoecifc plain card
regards
sanjeevkmrsAsked:
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You should use the calibration card supplied with the printer (see 2.3 in the manual linked to in your other question).  If you have lost this you can use any plain blank white business card.  The scanner will use this white test to calibrate future scans.  Make sure the contrast of the calibration scan is correct before accepting it.
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