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6 Appendices
Binary Scanning/Threshold
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The bmary scannmg functmn convem the ongmal into black and wtnte unage data. If the original
contains any mtermechate ~olors, they I~e ¢xm~a~ed
with the threshold value and determmed to be
e~ther bla~k or whtte ac~ordmgly The threshold value ~m be set to any of 255 gradattons, any
are darker than the threshold value are scanned as "black" "l'ms mode should be used to scan
ortgmals that have no mtermechate ~olors and conust of only two colors, such as text or hne
The threshold value should be set ac~ordmg to the mten~ty of the ongmal For example, semng
a ]ngh threshold value when scanmng faint text wall produce text that ~s much clem~ Conversely,
settmg a low threshold value when scanning an ortgmal that ~s on a colored background (such as
text on c~lored paper) wtll ehmmate the background ~lor from the s~an.
There are two modes for the threshold value setting
4, ~tandard mode
Any one of 255 values can be set
~ Dynaml© threshold
mode
T'ms func'aon ~s vahd only when the optmnal Image Processing Umt Type A ~s installed.
W~th tins mode, the optmml threshold value (g~ven the brightness of the original) ~s set
automa~cally
Ong,nal
COtlP4~t¥ LTD
T~FFF Ar~,R~ ~
High threshold value
Low th~hold value
Dynamic threshold mode
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