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105
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Peak sensitivity wavelengths for
the image reading sensor
Colors
(print colors)
Typical print colors
630(nm)
Shades of red
Rose
Pink
Red
Orange
Yellow
520(nm)
Shades of green Pale blue
Yellow
470(nm)
Shades of blue
Cobalt
Light cobalt
Sky blue
Light blue
Dropout wavelengths and print colors
OMR glossary
PCS (printed contrast signal)
Refers to the reflectance ratio (contrast) of printed marks, symbols, and letters
as opposed to reflectance of non-printing areas. The calculation formula is as
follows.
PCS = White reflectance - black reflectance
White reflectance
When reflectance of non-printing areas is 70%, and reflectance of printed marks,
symbols, and letters is 10%, the PCS will be 0.857.
d
d
Timing mark
Mark frame
Reading zone
Direct under type
If paper has pre-printed timing marks, the scanning area (reading area) of targeted
mark frames will be determined by such timing marks.
Direct under type is a method of reading a zone that is the same as the timing
mark width.
Other methods include timing control type, mark to mark type, and FACOM type.
