Operation Manual

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The Tool Chest — Analog Gain
Analog Gain
Analog Gain
Controlling the Scanner’s Light Source
Controlling the Scanner’s Light Source
The “Analog Gain” palette is used to adjust color by modify-
ing exposure for the colored elements in the scanner’s light
source. Gain is measured in Exposure Values (EVs), the same
unit used for measuring exposure compensation on many
cameras.
Analog gain
sliders and
text boxes
Redraw
button
Reset
button
The “Analog Gain” Palette
The “Analog Gain” Palette
The “Analog Gain” palette is only available when the scan window is
active.
Exposure Values
Exposure Values
Exposure Values are a measure of the quantity of light that falls on the
scanning element (Charge- Coupled Device, or CCD). At +1 EV, the
CCD is exposed to twice the normal amount of light, while at –1 EV, the
amount of light is halved. EVs are sometimes referred to as “steps.”
Smear
Smear
Choosing too high a value for exposure may produce “smear” or other
defects in the scanned image.
Analog Gain
Analog Gain
The status of analog gain is shown in the scan window information
panel. A warning icon ( ) will be displayed if the preview image has
not been updated to refl ect changes to analog gain.
The “Analog Gain” palette contains the following items:
Item Description
Master
Adjust exposure for all elements by dragging the slider
or by entering a value between –2.00 and +2.00 in the
text box to its right.
Red, Green,
Blue
Adjust exposure for the red, green, and blue elements
by dragging the sliders or by entering values between
–2.00 and +2.00 in the text boxes to their right.
Redraw
Update the preview image to refl ect changes to ana-
log gain.
Reset Reset all analog gain sliders to ±0.