C-8
Appendix - C --- Scanner Terms
Vector Drawing
Also called Vector File. Consists of mathematically
dened elements, such as “Line from A to B”, “Circle with
center and radius”, etc. CAD systems use vector draw-
ings because of their accuracy, relatively low memory
requirement and data-le sizes compared to raster im-
ages.
Vector File
Also called Vector Drawing. Consists of mathematically
dened elements such as: Line from A to B, Circle with
center and radius etc. CAD systems use vector drawings
because of their accuracy and relatively low memory and
data le sizes compared to raster images.
Vectorization
Also called raster-to-vector conversion (RTV). The pro-
cess of automatically converting a raster (bit-mapped)
image into a vector (CAD) drawing.
White Level
White Level is a setting in scan programs used if one
has an original with a background that is not completely
white. To get the background to appear as pure white
one can set the White Level to a lower value.
White Point Adjustment
An adjustment made that will determine the amount of
highlight detail in an image. The white point should be
set so that the lightest part of an image will only just
have zero detail
XYZ
The CIE system is based on the description of color as
a brightness (luminance) component Y (as described
above), and two additional components X and Z. The
spectral weighting curves of X and Z have been stan-
dardized by the CIE, based on statistics from experi-
ments involving human observers. XYZ tri-stimulus
values can describe any color.
Zoom
The ability to enlarge or shrink the view of the picture
in a window. Zoom does not alter the size of the nal
scanned picture; it only provides a better view while
creating a selection border on the screen.
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