Nikon 9235 Reference Manual - Page 57

Exposure Value, Analog Gain

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Analog Gain The controls in the Analog Gain palette are used to adjust colors by modifying exposure for each of the colored elements in the scanner's light source. Gain is measured in Exposure Values (EVs), the same unit used for exposure compensation on many cameras. The controls for analog gain consist of four sliders: a master slider that adjusts exposure for all elements in the scanner's light source, and separate red, green, and blue sliders for independent adjustments to the red, green, and blue LEDs. To view the effects of analog gain on the image in the preview area, click the Update button. To return the exposure value for all LEDs to ±0, click Reset. Exposure Value 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 -1EV, the amount of light is halved. EVs are sometimes referred to as "steps." The current status of analog gain is shown in the information display in the scan window. If changes are made to analog gain without redrawing the preview image, a warning icon will appear in the information display. Choosing too high a value for exposure may produce "smear" or other defects in the scanned image. Reference:The Tool Chest 56

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56
Reference:The Tool Chest
Analog Gain
The controls in the Analog Gain palette are used to adjust col-
ors by modifying exposure for each of the colored elements in
the scanner’s light source.
Gain is measured in Exposure Values
(EVs), the same unit used for exposure compensation on many
cameras.
The controls for analog gain consist of four sliders: a
master slider that adjusts exposure for all elements in the
scanner’s light source, and separate red, green, and blue sliders
for independent adjustments to the red, green, and blue LEDs.
Exposure Value
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 –1EV, the amount of light is halved.
EVs are some-
times referred to as “steps.”
To view the effects of analog gain on the image in the preview
area, click the
Update
button.
To return the exposure value
for all LEDs to
±
0, click
Reset
.
The current status of analog gain is shown in the information
display in the scan window.
If changes are made to analog gain
without redrawing the preview image, a warning icon will ap-
pear in the information display.
Choosing too high a value for exposure may produce “smear”
or other defects in the scanned image.