19
Prescanning
The usual method of operating the Better Light
camera centers around the tasks of prescanning the
scene, adjusting parameters to achieve the intended
image, then scanning the final image. This method
allows for iteratively adjusting the composition, lighting
and exposure to give the photographer confidence that
the image on screen will be the same one captured in the final scan.
Making a Prescan
The digital camera has a significant advantage over film in that representative image data can be
viewed immediately after the exposure, allowing accurate and repeatable determination of exposure,
color balance, and tonal range. This enables the photographer to precisely adjust the exposure and
processing conditions for each image, and to neutralize any unwanted color cast, or to introduce color
filtration as desired.
In addition to evaluating the preview image visually, a digital spot meter permits the photogra-
pher to accurately measure any point location within the preview image, and a histogram display pro-
vides an overall indication of the distribution of image data values.
There are two types of prescans available; the
normal prescan
and the
fast prescan
. Both types of
prescans can be initiated by clicking on the
button in the main control area.The camera will
then begin a prescan at the lowest resolution available for your model camera:
model 4000 series: 20% (1000 x 750 pixels, 4.2 MB)
model 6000 series and Super 6K™ series (1000 x 750 pixels, 4.2 MB)
Super 8K™ series (888 x 666 pixels, 3.4 MB)
To give the most accurate representation of the final scan image normal prescans are taken using
the currently selected
Line Time, ISO, Color
and
Tone
settings. The time necessary to complete the
prescan is displayed above the
Prescan
button.
Prescans of images to be captured without a tone curve (the “None 14-bit” tone curve
selection in the Tone panel) are captured and displayed using the previously selected tone
curve before switching to “None 14-bit”. This creates better image data and exposure rep-
resentations during the prescan and final scan preparation process. The final scan will be
made without a tone curve.
Prescan and Scan controls.
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