HP 6200C User Manual
Page 88
4
HP PrecisionScan Pro User’s Guide
88
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Examples of changing color channels
Images of a color drawing changed to the
Black &
White Bitmap (raster)
output type are shown with
different color channels and black and white
threshold settings applied in the
Black & White
Threshold
tool.
Original with
True Color
output
type
Black & White Bitmap (raster)
output type applied with
NTSC
Gray
color
channel and
automatic
threshold (110)
Red
color channel and
automatic threshold (110)
Green
color channel and
automatic threshold (110)
Blue
color channel and automatic
threshold (110)
Blue
color channel and higher
threshold (173)
The
NTSC Gray
channel in the
Scan using
channel
list box of the
Black & White
Threshold
tool converts color to gray at a
ratio of 30% red, 59% green, and 11% blue.
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