Microtek ArtixScan 120tf Reference Manual

84 Microtek ScanWizard Pro TX for Mac & PC
Gradation tool
The Gradation tool lets you adjust the midtones (the mid-level grays) of the
lightness channel “L” of an image without altering the color itself. This is because
even with changes to the luminance or lightness value, the chroma and hue
values are kept constant.
To prevent color images from losing saturation when adjusting the lightness,
ScanWizard Pro TX provides a Saturation Range option. With this option, colors
outside of a given chroma range are not affected by the manipulation of the
gradation curve.
.
How to read the curve
The Curve shows the relationship of
the brightness changes across the
middle pixels between the resulting
image and the original. When you
open the Curves dialog box, the line
on the graph is diagonal because
the Input and Output values are the
same.
When the curve is moved up or
down, the relationship between
input value and output value
changes accordingly.
• In areas where the curve is
moved down, pixels in that
portion of the image are
darkened.
• In areas where the curve is
moved up, pixels in that portion
of the image are lightened.
Contrast in an image can be seen by
the angle of the line. The steeper the
slope, the higher the contrast. The
closer the line is to horizontal, the
lower the contrast.
Original curve
Modified curve

Microtek ArtixScan 120tf Specifications

Power

voltage	AC 90V to 264V, 47-63 Hz

Operating Environment

operating temperature	50° to 95°F (10° to 35°C)
relative humidity	20% to 80%

Scanning Specifications

scanning area	6 x 9 cm Max., 6 x 7 cm, 6 x 6 cm, 6 x 4.5 cm, 25 x 38 mm
resolution optical	4, 000 dpi x 4, 000 dpi
resolution interpolated	16, 000 dpi x 16, 000 dpi

Interfaces

firewire ports	Two
scsi ports	Two
transmission speed firewire	4 Mbytes/s
transmission speed scsi	2 Mbytes/s

Weight and Dimensions

dimensions	19.8" x 10.8" x 5.5" (504 x 274 x 142 mm)
weight	17.6 lb (8 kg)